ML21089A364

Yttrium-90 Microsphere Brachytherapy Sources and Devices Therasphere and SIR-Spheres Licensing Guidance

ML21089A364
Person / Time
Issue date:	04/20/2021
From:	Katherine Tapp Office of Nuclear Material Safety and Safeguards
To:
Katie Tapp, NMSS/MSST
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ml21089A263:ML21089A263:ML21106A291	List: ML21089A364
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Download: ML21089A364 (23)

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Yttrium-90 Microsphere Brachytherapy Sources and Devices TheraSphere and SIR-Spheres Licensing Guidance April 20, 2021, Revision 10.2 NOTE: Revision 10.2 is being issued to reflect Boston Scientifics premarket approval (PMA) application for the TheraSphere Y-90 glass microspheres on March 21, 2021. Agreement State licensees should contact their state regulators to determine applicable guidance to support licensing of Y-90 microspheres.

NRC Contact Katie Tapp MedicalQuestions.Resource@nrc.gov

Table of Contents

1. Background......................................................................................................................... 1

2. 10 CFR 35.1000 Use .......................................................................................................... 1

3. Licensing Guidance ............................................................................................................ 2

4. General ............................................................................................................................... 2 4.1 Requirements not Specific to 10 CFR 35.1000 Use ..................................................... 2 4.2 Radionuclides, Form, Possession Limits, and Purpose of Use ..................................... 3 4.3 Facility Address and Description .................................................................................. 3 4.4 Leak Tests ................................................................................................................... 3

5. Training and Experience ..................................................................................................... 4 5.1 Authorized Users ......................................................................................................... 4 5.2 Radiation Safety Officer ............................................................................................... 8 5.3 Training and Experience Documentation ..................................................................... 8 5.4 Team Approach ........................................................................................................... 8 5.5 Notification ................................................................................................................... 9 5.6 Grandfathering ............................................................................................................10

6. License Commitments........................................................................................................10 6.1 Procedures for Administration .....................................................................................10 6.2 Written Directives ........................................................................................................11 6.3 Medical Event Reporting .............................................................................................12 6.4 Sealed Source and Device Use ..................................................................................13 6.5 Inventory .....................................................................................................................13 6.6 Labeling ......................................................................................................................14 6.7 Patient Release ..........................................................................................................14 6.8 Surveys.......................................................................................................................14 6.9 Radiation Protection Program Changes ......................................................................15 i

7. Notes to Licensees ............................................................................................................16 7.1 Change in Physical Conditions of Use ........................................................................16 7.2 Use of Other Y-90 Microspheres .................................................................................16 7.3 Waste Disposal Issues ................................................................................................16 7.4 Autopsy and Cremation ..............................................................................................18

8. Notes to Regulators ...........................................................................................................18 8.1 Inspection Frequency..................................................................................................18 8.2 Program Code ............................................................................................................18

9. Paperwork Reduction Act Statement..................................................................................19

10. Public Protection Notification ..........................................................................................20 ii

1. Background The licensing guidance for yttrium-90 (Y-90) microsphere brachytherapy was initially published in October 2002 and subsequently revised in 2004, 2007, 2008, 2011, 2012, and 2016. Following years of using the Y-90 licensing guidance, a working group composed of Agreement State representatives and U.S. Nuclear Regulatory Commission (NRC) staff was formed to update it based on stakeholder comments. Revision 10 updated the criteria for training and experience, medical event reporting, inventory requirement specifications, and waste disposal issues. Further, Revision 10 was updated to align the guidance with the final Title 10 of the Code of Federal Regulations (CFR) Parts 30, 32, and 35 rule, Medical Use of Byproduct Material Medical Event Definitions, Training and Experience, and Clarifying Amendments, which was published in the Federal Register on July 16, 2018 (83 FR 33102) and went into effect on January 14, 2019, for NRC licensees. Lastly, Revision 10 included a new section on surveys and provides new information regarding patient release, cremation, and autopsy. A draft revision was published in the Federal Register (82 FR 51655) on November 7, 2017, for public comment. Responses to comments received can be found in Agencywide Documents Access and Management System (ADAMS) Accession No. ML19030B536. Revision 10.1 added a delay in implementation in one of the new training and experience criteria as described in footnote 7 in Section 5. Staff has issued an administerial change in Revision 10.2 to remove, from Section 7, the Humanitarian Device Exemption (HDE) restrictions required for TheraSphere. Boston Scientifics premarket approval (PMA) application for the TheraSphere Y-90 glass microspheres was approved by the U.S. Food and Drug Administration (FDA) on March 21, 2021. Sirtex Medicals PMA for the Sir-Sphere Y-90 resin microspheres was approved by the FDA March 5, 2002.

2. 10 CFR 35.1000 Use Although Y-90 microspheres are manual brachytherapy sources used for permanent implantation therapy, Y-90 microspheres have many unique properties that merit radiation safety considerations other than those required by 10 CFR Part 35, Medical Use of Byproduct Material, Subpart F, Manual Brachytherapy. These unique properties include the microspheres small size, the large number of microspheres used in a treatment, and the route 1

of administration. As a result, Y-90 microsphere brachytherapy is regulated under 10 CFR 35.1000, Other medical uses of byproduct material or radiation from byproduct material 1.

3. Licensing Guidance This guidance provides applicants with the acceptable means in satisfying the requirements for a license for the use of TheraSphere and SIR-Spheres and is not intended to be the only means of satisfying the requirements for a license. The applicant must submit the information required to meet 10 CFR 30.33 and 35.12, as described below. The applicant should submit additional information and commitments requested below or may, unless the information is specifically required by regulation, submit alternative information and commitments for review by the NRC staff to make a licensing determination. The commitments incorporated into the license by license condition will be reviewed during routine inspections. If an applicant commits to the guidance provided below, the applicant is committing to follow commitments described with the use of the word should.

4. General 4.1 Requirements not Specific to 10 CFR 35.1000 Use Applicants must commit to meet the general requirements in 10 CFR Part 35, Subpart A, General Information; Subpart B, General Administrative Requirements; Subpart C, General Technical Requirements; Subpart L, Records; and Subpart M, Reports, except as specified in this guidance. Additionally, applicants must meet applicable requirements of 10 CFR Part 19, Notices, Instructions and Reports to Workers: Inspection and Investigations; Part 20, Standards for Protection Against Radiation; and Part 30, Rules of General Applicability to Domestic Licensing of Byproduct Material.

1 10 CFR 35.1000 is designated as Compatibility Category D. Agreement States are not required to adopt these regulations for purposes of compatibility but are not prohibited from adopting Compatibility Category D regulations if they so choose. If Agreement States choose to adopt this licensing guidance, references to 10 CFR should be changed to the equivalent Agreement State regulations.

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4.2 Radionuclides, Form, Possession Limits, and Purpose of Use Pursuant to 10 CFR 35.12, the applicant shall identify the radionuclide, chemical/physical form, requested maximum possession limit, and purpose of use. This information may be submitted under a signed, dated letter or NRC Form 313, Application for Materials License. The following table provides the format for an acceptable request.

TheraSphere SIR-Spheres Radionuclides Yttrium-90 Yttrium-90 (NRC Form 313 Item 5a)

Chemical/Physical Form Glass microsphere (current Resin microsphere (current (NRC Form 313 Item 5b) manufacturer as listed in the manufacturer as listed in the Sealed Source and Device Sealed Source and Device Registry [e.g., BWXT Registry [e.g., Sirtex Model Medical Ltd. Model SIR-Spheres])

TheraSphere])

Maximum Possession Limit X* Ci total X* Ci total (NRC Form 313 Item 5c)

Purpose of Use TheraSphere for permanent SIR-Spheres for permanent (NRC Form 313 Item 6) brachytherapy using delivery brachytherapy using delivery system as listed in the system as listed in the Sealed Source and Device Sealed Source and Device Registry Registry

• Based on the maximum amount the applicant anticipates having at one time (i.e., 3 Ci) 4.3 Facility Address and Description Provide an address of use and description of the location where the Y-90 microspheres will be used and stored.

4.4 Leak Tests Leak tests are not required for Y-90 microspheres. The small size and large number of Y-90 microspheres make leak testing, as required by 10 CFR 35.67(b), impractical. Further, leak 3

testing is not required as the activity of each Y-90 microsphere is below the threshold in 10 CFR 35.67(f)(3).

5. Training and Experience 5.1 Authorized Users NRC has determined that individuals meeting the Authorized User (AU) training and experience (T&E) criteria A, B, and C provided below can be authorized for the use of Y-90 microsphere brachytherapy. Applicants may also submit alternative T&E criteria to be reviewed on a case-by-case basis by NRC staff. The alternative T&E commitments should include an explanation of why the applicant believes the alternative T&E commitments demonstrate that the individuals are qualified to be an AU.

A.

1. Is identified as an AU for medical use in 10 CFR 35.1000 for Y-90 microspheres, 10 CFR 35.400, Use of sources for manual brachytherapy, or for medical uses in 10 CFR 35.300, Use of unsealed byproduct material for which a written directive is required, that includes the use described in 10 CFR 35.390(b)(1)(ii)(G)(3) on one of the following licenses or permits that authorizes the medical use of byproduct material: A Commission or Agreement State license, a permit issued by a Commission master materials licensee, a permit issued by a Commission or Agreement State licensee of broad scope, or a permit issued by a Commission master materials license broad scope permittee; or

2. Meets the training and experience requirements of 10 CFR 35.390 or 10 CFR 35.490; or

3. Meets the training and experience guidelines as follows:

i.

a. Experience in diagnostic radiology demonstrated by:

(a) Board certification in interventional radiology/diagnostic radiology by the American Board of Radiology (ABR)2; or (b) Board certification in diagnostic radiology by the ABR2; or 4

(c) Board certification in diagnostic radiology by the American Osteopathic Board of Radiology (AOBR) 2; or (d) Three years supervised clinical experience in diagnostic radiology; and

b. Experience in interventional radiology demonstrated by:

(a) Board certification in interventional radiology/diagnostic radiology by the ABR2; or (b) Board subspecialty certification in interventional radiology by the AOBR2; or (c) One year of supervised clinical experience in interventional radiology; and ii. Has 80 hours9.259259e-4 days <br />0.0222 hours <br />1.322751e-4 weeks <br />3.044e-5 months <br /> of classroom and laboratory training 3 for byproduct material requiring a written directive, applicable to Y-90 microspheres, which may be concurrent with training received in accordance with criterion A.3.i in:

a. Radiation physics and instrumentation; and

b. Radiation protection; and

c. Mathematics pertaining to the use and measurement of radioactivity; and

d. Radiation biology; iii. Has work experience under the supervision of an AU for Y-90 microsphere brachytherapy or training provided by a Y-90 microsphere manufacturer representative involving:

a. Ordering, receiving, and unpacking radioactive materials safely and performing the related radiation surveys; and

b. Performing quality control procedures on instruments used to determine the activity of Y-90 microspheres and performing checks for proper operation of survey meters; and

c. Calculating and measuring the activity and safely preparing the Y-90 microspheres to be delivered to the patient or human research subject; and

d. Using procedures to control and to contain spilled byproduct material, including Y-90 microspheres, safely and using proper decontamination procedures. The 2 As noted on the NRC's Medical Uses Licensee Toolkit Web site, the NRC-approved ABR and AOBR certificates contain the words "AU eligible" above the ABR or AOBR seal. For the purposes of this guidance, the NRC deems the certificates issued without AU Eligible to be adequate to meet the T&E guidelines in criteria A.3.i.a and A.3.i.b.

3 For Board Certified physicians, if the Board Certification is recognized by the NRC on the NRC's Medical Uses Licensee Toolkit Web site for 10 CFR 35.290, 35.390, 35.392, 35.394, and 35.396, the applicant or licensee need not submit detailed documentation of those AUs classroom and laboratory training to satisfy section A.3.ii. The applicant or licensee need only confirm that the individual has completed training on the use of Y-90 microspheres.

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procedures should address any special circumstances that may be encountered, such as the electrostatic charge of Y-90 microspheres and the proper survey instrument and survey technique for beta emitters 4; and iv. Has work experience or training under the supervision of an AU for the type of Y-90 microsphere brachytherapy the applicant is requesting, including:

a. Preparing and administering patient dosage. The individual does not have to be the physician who places the micro-catheter or administers patient dosage, but it is necessary that the individual have training in the administration process, including selection of activity of Y-90 microspheres to be administered to each treatment site and catheter positioning to ensure administration of the Y-90 microspheres is in accordance with the written directive; and

b. Using administrative controls to prevent a medical event involving the use of byproduct material 5; and

c. Evaluation of patient or research subjects treatments to determine whether the administered dosage was in accordance with the written directive or if a medical event has occurred.

B.

Has successfully completed training in the operation of the delivery system, safety procedures, and clinical use for the type of Y-90 microsphere for which authorization is sought. This requirement may be satisfied by completing a training program provided by the vendor for new users or by receiving training supervised by an AU 6 who is authorized for the type of Y-90 microsphere for which the individual is seeking authorization. Clinical use training to support unsupervised use should include at least three hands-on patient cases for each type of Y-90 microsphere requested, conducted in the physical presence of an AU6, 7 who is authorized for the type of Y-90 microsphere for which the individual is seeking authorization.

4 Appendix N, Model Emergency Procedures, NUREG-1556, Volume 9 provides additional guidance.

5 Appendix S, Model Procedures for Developing, Maintaining, and Implementing Written Directives, NUREG-1556, Volume 9 provides additional guidance.

6 A physician who is not an AU but who meets the T&E criteria for the applicable type of Y-90 microsphere may be approved to supervise another physicians training or first hands-on patient cases on a case-by-case basis.

7 The NRC has been alerted to concerns that requiring this case work be conducted in the physical presence of an AU6 is a significant change from past revisions and if implemented immediately, could cause a delay in training future physicians. Therefore, the NRC is allowing clinical casework to be conducted in the physical presence of a manufacturer representative in place of an AU6 until November 8, 2021. This manufacturer representative can provide a written 6

However, if a proposed AU cannot complete patient cases prior to authorization; the licensee may request conditional approval with the proposed AUs completion of at least three mock simulated cases. Mock simulated cases should demonstrate issues that are encountered during Y-90 microsphere administration procedures and should be completed by the individual in the physical presence of a manufacturer representative or an AU6 who is authorized for the type of Y-90 microsphere for which the individual is seeking authorization.

Following conditional approval, the individual should complete the clinical casework described above, including case work, within a year following the license issuance or amendment that names the individual as an AU for Y-90 microsphere use. The licensee may submit documentation to the NRC requesting an extension of this timeframe. The supporting documentation should include a commitment to perform continuing T&E (e.g.,

one additional mock case prior to performing patient cases) in the use of the type of Y-90 microsphere requested until the first three patient cases are completed, and C.

Has obtained written attestation that the individual has satisfactorily completed the requirements in criteria A and B of this section and is able to independently fulfill the radiation safety-related duties as an AU for the type of Y-90 microsphere requested. The attestation must be obtained from either:

1. An AU6, 7 who is authorized for the type of Y-90 microsphere for which the individual is seeking authorization; or

2. A residency program director who affirms in writing that the attestation represents the consensus of the residency program faculty where at least one faculty member is a physician who is an AU6 for the type of Y-90 microsphere brachytherapy being authorized and concurs with the attestation provided by the residency program director. The residency training program must be approved by the Residency Review Committee of the Accreditation Council for Graduate Medical Education or the Royal College of Physicians and Surgeons of Canada or the Council on Postdoctoral Training of the American Osteopathic Association and must include T&E specified in criteria A and B of this section.

attestation that the individual has satisfactorily completed requirements in criteria B. After this date, the casework and written attestation should be completed in the physical presence of an AU6.

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In accordance with 10 CFR 35.59, the T&E specified above must have been obtained within the seven years preceding the date of application or the individual must have had related continuing education and experience since the required T&E was completed. Recent training provided under Section B may be sufficient to show recentness of training. This recentness of training requirement applies to all individuals, including those who are board certified or listed as an AU on an NRC or Agreement State license.

5.2 Radiation Safety Officer The Radiation Safety Officer (RSO) must have training as specified in 10 CFR 35.50, including training in radiation safety, regulatory issues, and emergency procedures for Y-90 microsphere use. An RSO already listed on a license that includes one type of Y-90 microsphere device does not require additional approval for another type of Y-90 microsphere device but should be familiar with all radiation safety aspects, including cleaning up spills, associated with all devices used at the facility.

5.3 Training and Experience Documentation The applicant must submit documentation of the above T&E for all physicians requesting authorization to use Y-90 microspheres. This documentation shall include the clinical use cases and written attestation and supervising physician T&E, if necessary. For individuals completing the patient cases following the license amendment, this documentation shall include documentation from the manufacturer representative or supervising physician of the three mock simulated cases and a commitment that each individual will complete at least the first three hands-on patient cases supervised in the physical presence of an AU6 who is authorized for the type of Y-90 microsphere for which the individual is seeking authorization. The documentation should commit to initiating these three cases within six months following the license issuance or amendment that names the individual as an AU for Y-90 microsphere use and complete the three cases within a year. Additionally, for applicants that have individuals completing the patient cases following the license amendment, the applicants commitment will include submitting documentation from the manufacturer to the appropriate NRC Regional Office within 60 days of when these three patient cases have been satisfactorily completed.

5.4 Team Approach 8

Microsphere brachytherapy treatment is usually conducted using a multi-disciplinary team approach. The AU should consult with individuals, as necessary, with expertise in:

• cancer management (e.g., radiation or medical oncology);

• catheter placement;

• radiation dosimetry; and

• safe handling of unsealed byproduct material.

One individual may satisfy more than one of the listed areas of expertise. The applicant shall commit to provide training in the licensees procedures to all individuals involved in Y-90 microsphere use, commensurate with the individuals duties to be performed. This training must be provided to all individuals preparing, measuring, performing dosimetry calculations, or administering Y-90 microspheres.

5.5 Notification The NRC recognizes that, if an AU satisfies the T&E listed in NRCs licensing guidance for Y-90 microspheres and is currently listed on a Commission or Agreement State medical use license or permit for a specific type of microsphere, the AU should be allowed to work under a different license for the medical use of the same type of microsphere. A limited specific medical use applicant initially applying for authorization for the medical use of Y-90 microspheres or an existing licensee applying for an amendment may request authorization to notify the NRC in the future that it has permitted an AU to work at its facility without requesting an additional license amendment, provided the following conditions are met:

1. the AU satisfies the T&E listed in this licensing guidance for Y-90 microspheres; and

2. the AU is currently listed for the same type of Y-90 microsphere use on a Commission or Agreement State license, a permit issued by a Commission master materials licensee, a permit issued by a Commission or Agreement State licensee of a broad scope, or a permit issued by a Commission master materials license broad scope permittee; and

3. the licensee provides the NRC a copy of the license or permit on which the AU is listed for the specific Y-90 microsphere use; and

4. the licensee provides the NRC documentation of the completion of three patient cases if previously not submitted to the NRC; and 9

5. the licensee provides documentation of the above listed conditions to NRC for each AU no later than 30 days after the date that the licensee allows the AU to work as an AU for the specific type of Y-90 microsphere.

If this authorization is approved, these notification conditions will be incorporated as license conditions on the license.

5.6 Grandfathering If a licensee adopts this licensing guidance revision, physicians who are currently authorized for the medical use of a specific type of Y-90 microsphere under T&E criteria listed in previous revisions do not have to meet the revised criteria in this revision for that type of Y-90 microsphere.

6. License Commitments The applicant shall commit to follow all the requirements in 10 CFR Part 35 for brachytherapy sources and manual brachytherapy use, except where replaced by the following licensing commitments:

6.1 Procedures for Administration The licensee must have procedures for administration requiring a written directive as specified in 10 CFR 35.41, specifically to ensure high confidence that the patients or human research subjects identity is verified before each administration and each administration is in accordance with the written directive. As Y-90 microspheres are too small to be calibrated in accordance with 10 CFR 35.432, the licensee shall determine and record the activity of each dosage before medical use in accordance with 10 CFR 35.63 and 10 CFR 35.60 even though Y-90 microspheres are listed as sealed sources in their Sealed Source and Device Registries. The licensee shall commit to following the manufacturers procedures or submit alternative methods for calculating and documenting the dose or activity to the treatment site; preparing the dose for administration; determining shunting to non-treatment sites; and determining if a medical event has occurred (e.g., performing pre- and post-vial dose measurements with appropriate instrumentation, evaluating post-treatment imaging). For the purpose of this guidance, shunting 10

is defined as blood flow through pathway or bypass due to patient vasculature causing the Y-90 microspheres to flow to an unwanted location. Unexpected dose or activity to an organ or tissue other than the treatment site that is caused by catheter placement during delivery of the Y-90 microspheres is not considered shunting and should be evaluated as a possible medical event.

Administration of Y-90 microspheres must be performed in accordance with the written directive.

The licensee shall record the dose or activity delivered to the treatment site. The record shall be prepared within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after the completion or termination of the administration and must include the name of the individual who determined the dose or administered activity and the date the record is completed.

6.2 Written Directives The licensee must complete a written directive, which must be dated and signed by an AU before the administration in accordance with 10 CFR 35.40(a) and 10 CFR 35.40(c) unless a delay in order to provide a written directive would jeopardize the patient's health, as allowed under 10 CFR 35.40(c)(1). The licensee shall retain a copy of the written directive in accordance with 10 CFR 35.2040.

Due to the unique properties of Y-90 microsphere brachytherapy, the following written directive condition should be used instead of 10 CFR 35.40(b).

The written directive shall include the patient or human research subjects name; the treatment site; the radionuclide (including the physical form [Y-90 microspheres]); the model of spheres (e.g. TheraSphere or SIR-spheres) or manufacturer; the prescribed dose or activity; and, if appropriate for the type of microsphere used, the statement or dose or activity delivered at stasis.

For the purpose of written directive and medical event reporting requirements in the Y-90 microsphere guidance, prescribed dose means the total dose (rad or Gy). Alternatively, prescribed activity (mCi or GBq) may be used in lieu of prescribed dose. If prescribed activity is used in lieu of prescribed dose, the activity shall be used for all documentation and evaluations.

As described in 10 CFR 35.2, treatment site means the anatomical description of the tissue intended to receive a radiation dose, as described in a written directive. For instance, the 11

treatment site may be described as the lobe or segment that is intended to receive the Y-90 microspheres and the tissue that is expected to receive Y-90 microspheres due to shunting. For the purpose of this guidance, stasis is defined as a stoppage or slowdown in the flow of blood.

The inability to complete administration due to clogging or kinking of the catheter is not considered stasis.

6.2.1 Termination of Treatment Due to Stasis If the administration was terminated because of stasis, then the total dose or activity to the treatment site is the value of the total dose or activity administered when stasis occurred and the administration was terminated. The record shall be prepared within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after the completion or termination of the administration and must include the name of the individual who determined the administered dose or activity, the signature of an AU for Y-90 microspheres, and the date signed.

6.2.2 Emergent Patient Conditions If the procedure must be modified due to emergent patient conditions that prevent administration in accordance with the written directive (e.g., artery spasm or sudden change in blood pressure), the AU shall document such changes in the written directive within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after the completion or termination of the administration. The modification to the written directive shall include the reason for not administering the intended dose or activity, the signature of an AU for Y-90 microspheres, and the date signed.

6.3 Medical Event Reporting In place of 10 CFR 35.3045(a), the licensee shall commit to report any event, except for an event that is caused by shunting as described in the criteria below, or as a result of patient intervention, as defined in 10 CFR 35.2 as an actions by the patient or human research subject, whether intentional or unintentional, such as dislodging or removing treatment devices or prematurely terminating the administration. The criteria for event reporting is:

• the administration of byproduct material results in a dose that exceeds 0.05 Sv (5 rem) effective dose equivalent or 0.5 Sv (50 rem) to an organ or tissue; and o an administration of the wrong radionuclide or type of microsphere; or 12

o an administration to the wrong individual or human research subject; or o an administration by the wrong route of administration; or o an administration by the wrong mode of treatment; or

• the total dose or activity delivered differs from the prescribed dose or activity, as documented in the written directive, by 20 percent or more, except when stasis or emergent patient conditions are documented and resulted in a total dose or activity administered that was less than that prescribed; or

• A dose to the skin or an organ or tissue other than the treatment site that exceeds by 0.5 Sv (50 rem) to an organ or tissue and 50 percent or more of the dose expected from the administration defined in the written directive (excluding shunting as defined in Section 6.1 when shunting was evaluated prior to the treatment in accordance with the manufacturers procedures.)

Additionally, the licensee shall comply with the medical event reporting and notification requirements as described in 10 CFR 35.3045(b)-(g).

6.4 Sealed Source and Device Use The licensee should commit to use only yttrium-90 microspheres for therapeutic medical uses as approved in the Sealed Source and Device Registries for TheraSphere and SIR-spheres, including maximum activity per vial limit.

6.5 Inventory Due to the short half-life of Y-90 (64 hours7.407407e-4 days <br />0.0178 hours <br />1.058201e-4 weeks <br />2.4352e-5 months <br />) and the fact that microspheres are not managed as individual discrete sources, the requirements in 10 CFR 35.67 for semi-annual physical inventory of brachytherapy sources and recordkeeping in 10 CFR 35.2406 are not applicable to microspheres. Rather, the requirements for brachytherapy source accountability (10 CFR 35.406), receipt (10 CFR 20.1906), labeling (10 CFR 20.1904 and 10 CFR 35.69), storage (10 CFR 20.1801 and 10 CFR 35.92), and disposal (see the Waste Disposal Issues section of this guidance document) are sufficient to ensure accountability of Y-90 in the form of microspheres possessed by a licensee.

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6.6 Labeling The licensee should commit to the following when the Y-90 microspheres are placed in vials, syringes, or radiation shields that are not labeled by the manufacturer:

• Label vials and vial radiation shields with the radioactive device (i.e. SIR-spheres, TheraSphere); and

• Label syringes and syringe radiation shields with the radioactive device.

6.7 Patient Release The licensee should commit to develop procedures that describe measures taken to ensure that radiation emissions, which may include bremsstrahlung, from each patient or human research subject permits his or her release in accordance with 10 CFR 35.75. Guidance for release of patients or human research subjects following administration of radioactive materials may be found in Regulatory Guide 8.39, Release of Patients Administered Radioactive Materials.

6.8 Surveys As the Y-90 microspheres are too small to be seen, licensees should survey, with an appropriate radiation detection survey instrument, all areas that the Y-90 microspheres are prepared for use or administered. The survey should be conducted immediately following each preparation and administration in unrestricted areas and by the end of the day for restricted areas. A licensee should retain a record of each survey for three years and the record should include the date of the survey, the results of the survey, the instrument used to perform the survey, and the name of the individual who performed the survey. Licensees do not need to perform surveys in an area(s) where patients or human research subjects are confined when they cannot be released under 10 CFR 35.75.

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6.9 Radiation Protection Program Changes This guidance may be revised as additional experience is gained regarding the medical use of TheraSphere and SIR-Spheres Y-90 microspheres. A licensee currently authorized to use these products that is committed by license condition to following provisions in a previous revision of this guidance may request a license amendment to commit to following this revision of the guidance instead. The licensee must apply for and receive this license amendment in order to make program changes to conform to this revision of the guidance.

An applicant initially applying for authorization for the medical use of TheraSphere and SIR-Spheres Y-90 microspheres, or a licensee applying for an amendment to conform with this revision of the guidance may request to incorporate into its license a change process similar to 10 CFR 35.26. Such a change process can allow some future changes to radiation safety programs without a license amendment provided that the change process requires the following conditions to be met for revisions to the radiation safety program:

1. the revision is in compliance with the regulations; and

2. the revision is based upon NRCs current guidance for TheraSphere and SIR-Spheres Y-90 microspheres 35.1000 use posted on the NRCs Medical Uses Licensee Toolkit Web site; and

3. the revision has been reviewed and approved by the licensees RSO and licensees management; and

4. the affected individuals are instructed on the revised program before the change is implemented; and

5. the licensee will retain a record of each change for five years; and

6. the record will include a copy of the appropriate website guidance, the old procedure, the new procedure, the effective date of the change, and the signature of the licensee management that reviewed and approved the change.

If approved, these conditions for use of the updated guidance will be incorporated as license conditions in the license.

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7. Notes to Licensees 7.1 Change in Physical Conditions of Use If the physical conditions of use exceed those reported in the Sealed Source and Device (SSD) certificate, the limited specific medical use licensee shall request an amendment for the new conditions, and a broad scope licensee shall perform its own engineering and radiation safety evaluation addressing those differences.

7.2 Use of Other Y-90 Microspheres The SSD safety evaluation for a specific manufacturers Y-90 microsphere does not cover the use of any other Y-90 microspheres, including those prepared by an authorized nuclear pharmacist or an AU qualified to prepare radioactive drugs. The medical use of such a source will require a new SSD certificate (or safety evaluation by the broad scope medical use licensee) that addresses the conditions of use, safety of the new Y-90 microspheres, and compatibility of the new microspheres with the microsphere delivery system(s).

The SSD safety evaluation for a given manufacturers Y-90 microsphere delivery system does not cover the use of that manufacturers Y-90 microspheres with another manufacturers delivery system or the use of another manufacturers Y-90 microspheres with the given manufacturers delivery system. Before authorization, the medical use of such a delivery system will require a new SSD certificate (or safety evaluation by the broad scope medical use licensee) that addresses the conditions of use, safety of the microsphere delivery system, and compatibility of the new delivery system with the Y-90 microspheres.

7.3 Waste Disposal Issues Y-90 microspheres are known to potentially contain radioactive impurities, some of which are long-lived (i.e., half-lives of greater than 120 days) (Refer to Information Notice (IN) 2007-10, Yttrium-90 Therasphere and Sirspheres Impurities). Due to different manufacturing processes, the activity and radionuclides of the i-mpurities vary for different Y-90 microsphere products. Impurities that have been recently found in reactor-activated microspheres include 16

small amounts of long-lived radionuclides such as europium-152, europium-154, and cobalt-60. 8 Impurities that have been recently found from microspheres with generator-produced Y-90 include trace amounts of strontium-90. 9 Licensees should be aware that the activity and type of impurities can change and be different from that described above. The NRC does not limit manufacturers to specific manufacturing processes, and it is therefore possible for the activity and types of radionuclide impurities to change for both products. Additionally, unused or partially used vials are likely to contain higher activities of impurities.

Although impurities need not be listed on an NRC license; licensees are responsible to ensure the microspheres are handled and disposed of in accordance with 10 CFR Part 20 and Part 35 requirements. Specifically, 10 CFR 35.92 requires that licensees monitor byproduct material with a physical half-life of less than or equal to 120 days at the surface before disposal and determine that its radioactivity cannot be distinguished from the background radiation level with an appropriate radiation detection survey meter before disposal. Therefore, regardless of the length of time they have been allowed to decay, licensees are not permitted to dispose of Y-90 microspheres if radioactivity can be distinguished from the background radiation level with an appropriate radiation detection survey meter.

If waste is determined to contain impurities with a physical half-life of greater than 120 days that can be distinguished from the background radiation level with an appropriate radiation detection survey meter, the licensee may need to use one or more of the following means to dispose of waste associated with the Y-90 microspheres:

• return the Y-90 microspheres to the manufacturer, if the manufacturer is authorized to receive Y-90 microspheres; or 8 J. Metyko, J. Williford, W. Erwin, J. Poston, S. Jiminez. Long-lived Impurities of 90Y-labeled microspheres, TheraSphere and SIR-Spheres, and the impact on patient dose and waste management. Health Phys. 103(3), S204-S208 (2012).

9 J. Metyko, W. Erwin, J. Poston, and S. Jimenez. 90Sr Content in 90Y-labeled SIR-Spheres and Zevalin. Health Phys.

107(5), S177-S180 (2014) 17

• transfer the Y-90 microspheres to an authorized recipient pursuant to requirements in 10 CFR Part 20 and Part 30.

See Regulatory Issue Summary 2004-17, Revision 1, Revised Decay-in-Storage Provisions for the Storage of Radioactive Waste Containing Byproduct Material, for more information regarding requirements for holding waste for decay-in-storage.

7.4 Autopsy and Cremation Y-90 microspheres are permanent implants that are not removed from the body by biological methods. Because Y-90 has a 64-hour half-life, Y-90 will likely have significantly decayed before a patients death. Patients treated with Y-90 microspheres will not usually represent an external radiation hazard to persons handling the body. However, in the case of autopsy or cremation, the radiation hazard increases due to the need for individuals to handle tissues that may contain radioactive material, especially if the death occurs soon after treatment with Y-90 microspheres.

The National Council on Radiation Protection and Measurements (NCRP) Report No. 155, Management of Radionuclide Therapy Patients, December 2006, may contain helpful information for radiation safety considerations associated with autopsy or cremation of patients with permanent implants. Additionally, NUREG-1556, Volume 9, Appendix N, Model Emergency Procedures, contains additional guidance regarding autopsy and cremation of patients who have received therapeutic amounts of radionuclides.

8. Notes to Regulators 8.1 Inspection Frequency Licenses authorizing Y-90 microsphere brachytherapy should be inspected every two years. Per Enclosure 1 to Inspection Manual Chapter 2800, licenses authorizing emerging technology under 10 CFR 35.1000 are assigned a Priority 2 inspection code.

8.2 Program Code The NRC regions should use program code 02240.

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9. Paperwork Reduction Act Statement This Licensing Guidance provides voluntary guidance for implementing the mandatory information collections in 10 CFR Parts 30 and 35 that are subject to the Paperwork Reduction Act of 1995 (44 U.S.C. 3501 et. seq.). These information collection were approved by the Office of Management and Budget (OMB), approval numbers 3150-0017 and 3150-0010. Send comments regarding this information collection to the Information Services Branch (T6-A10M),

U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001, or by e-mail to Infocollects.Resource@nrc.gov, and to the OMB reviewer at: OMB Office of Information and Regulatory Affairs (3150-0017, 3150-0010), Attn: Desk Officer for the Nuclear Regulatory Commission, 725 17th Street, NW Washington, DC 20503; e-mail: oira_submission@omb.eop.gov.

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10. Public Protection Notification The NRC may not conduct or sponsor, and a person is not required to respond to, a collection of information unless the document requesting or requiring the collection displays a currently valid OMB control number.

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