ML20248B658

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Registry of Radioactive Sealed Sources & Devices,Safety Evaluation of Sealed Source for Model 4F3B. Certificate:NR-460-S-880-S
ML20248B658
Person / Time
Issue date: 01/26/1996
From: Steven Baggett, Doug Broaddus
NRC
To:
Shared Package
ML20248B663 List:
References
SSD, NUDOCS 9806010355
Download: ML20248B658 (22)
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{{#Wiki_filter:.. a REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALED SOURCE NO : NR-460-S-880-S DATE: January 26, 1996 PAGE 1 OF 6 SEALED SOURCE TYPE: Gamma Source MODEL: 4F3B s MANUFACTURER / DISTRIBUTOR: 3M Health Physics Services 2M Center, Building 224-2E-06 St. Paul, MN 55144-1000 ISOTOPE: MAXIMUM ACTIVITY: Cobalt-60 1.000 curie (37.00 GBq) LEAK TEST FREOUENCY: 6 Months PRINCIPAL USE: (T) Other CUSTOM SOURCE: YES X NO 9806010355 960126 PDR RC SSD. PDR

REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALED SOURCE NO.: NR-460-S-880-S 'DATE: January 26, 1996 PAGE 2 OF 6 SEALED SOURCE TYPE: Gamma Source DESCRIPTION: The 4F3B is a doubly-encapsulated sealed source. Cobalt-60 is absorbed into small ceramic particles ranging from 0.001-0.008 in. (30-200 microns) in diameter. The isotope is then permanently fixed to the ceramic particles using a heat treatment to create 3M. Brand Radiating Microspheres. The microspheres are encased in a 0.742 in. (1.885 cm) long, 0.499 in. (1.267 cm) outer diameter, 0.375 in. (0.953 cm) inner diameter inner capsule with a wall across one end which has an average thickness of 0.063 in. (0.160 cm). After the microspheres are inserted, a 0.375 in. (0.953 cm) nominal diameter, 0.125 in. (0.318 cm) thick inner plug is inserted into the inner capsule and silver brazed in place, sealing the microspheres inside. The entire inner assembly is then inserted, plug-end first, into a 1.000 in. (2.540 cm) long, 0.750 in. (1.905 cm) outer diameter, 0.500 in. (1.270 cm) nominal inner diameter outer capsule with a 0.125 in. (0.318 cm) thick wall across one end. A 0.500 in. (1.270 cm) average diameter, 0.125 in. (0.318 cm) thick outer plug with a 0.500 in. (1.270 cm) long threaded stud extending from it is inserted, with the stud facing out, into the outer capsule and heliarc welded in place, sealing the inner assembly inside. The completed Model 4F3B source is 1.474 in. (3.744 cm) long (including the threaded stud) with a maximum diameter of 0.750 in. (1.905 cm). Both capsules and both plugs are made from type 347 stainless steel. DIAGRAM: See Attachment 1 i

7 REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALED SOURCE i NO.: NR-460-S-880-S DATE: January 26, 1996 PAGE 3 OF 6 i SEALED SOURCE TYPE: Gamma Source LABELING: Depending upon the end use of this source, either the following information was engraved on the exterior of the outer capsule or-a permanent-type label containing the information presented below plus the radiation symbol was affixed to the exterior of the outer capsule. Caution Radioactive Material XXX millicuries Co-60 Serial No. XXX Model 4F3B l Date 3M Company l CONDITIONS OF NORMAL USE: l The source was designed to be used in applications where a high-integrity gamma source is required, particularly where extreme environmental conditions exist. PROTOTYPE TESTING: The following tests were performed on prototype models of this source. After each test, the source was wipe tested and-leak tested. The wipe tests were counted in a detection instrument capable of detecting less than 0.0001 Ci-(3.700 Bq) of removable cobalt-60. The leak tests were performed by immersing the source 'for.a minimum of 10 seconds in water at 200*F (93.33*C) and observing any bubbles generated. All leak. tests were negative.

1. Heat test - Heat the source at 1,832*F.(1,000*C) for 30 minutes.
2. Ouench test - Quench the source from 1,832*F (1,000*C) to the temperature of cold water.
3. Molten lead test - Immerse the source in molten lead at 932*F (500*C) for 30 minutes.

REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALED SOURCE NO.: NR-460-S-880-S DATE: January 26, 1996 PAGE 4 OF 6 SEALED SOURCE TYPE: Gamma Source PROTOTYPE TESTING: (Continued) 4. Imoact test - Drop a weight generating 2 ft-lb on the sides of the source at.two points 180' apart and on each end, performing the test 20 times on each point. EXTERNAL RADIATION LEVELS: External radiation dose rates were calculated for a 1.000 Ci (37.00 GBq) Co-60 source as follows: Distance Maximum Radiation Level (from surface) (cm) (in) (R/hr) (Sv/hr) 5 1.97 538 5.38 30 11.81 14.7 0.147 i 100 39.37 1.35 0.014 OUALITY ASSURANCE AND CONTROL: j The following quality control procedures were followed during production of this source:

1. After-the inner plug was silver brazed in place, the inner capsule was cleaned until wipe tests revealed less than 0.0005 Ci (18.50 Bq) of removable Cs-137 contamination.
2. After the outer plug was silver brazed or welded in place, the source was wipe tested.

If the wipe revealed greater then 0.0001 Ci (3.700 Bq), the source was cleaned until the 0.0001 C1 (3.700 Bq) wipe test limit was reached. 1 I i L-

f 1 l l REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALED SOURCE l NO.: NR-460-S-880-S DATE: January 26, 1996 PAGE 5 OF 6 i SEALED SOURCE TYPE: Gamma Source OUALITY ASSURANCE AND CONTROL: (Continued)

3. The source was stored for 7 days and wipe tested again.

If this wipe test revealed greater than 0.0001 Ci (3.700 Bq) of removable Cs-137 contamination, the source was rejected.

4. The source was wipe tested again prior to shipment.

This wipe test also had to reveal less than 0.0001 Ci (3.700 Bq) of removable Cs-137 contamination. LIMITATIONS AND/OR OTHER CONSIDERATIONS OF USE: This source may be used only by persons specifically licensed by the NRC or an Agreement State. Handling, storage, use, transfer, and disposal: to be determined by the licensing authority. This source shall be leak tested at intervals not to exceed-6 months'using techniques capable of detecting 0.005 microcurie (185.0 Bq) of removable contamination. This registration sheet and the information contained within the references shall not be changed without the written consent of the NRC. SAFETY ANALYSIS

SUMMARY

The Model 4F3B sealed source is not a current product manufactured or distributed by 3M Health Physics Services. However, 3M Health Physics Services will continue to receive 4F3B sources for disposal. Based on our review of the Model 4F3B sealed source, and the information and test data cited below, we continue to conclude that this sealed source is acceptable for specific licensing purposes.

REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALED. SOURCE NO.: LNR-460-S-880-S -DATE: January 26, 1996 PAGE 6 OF 6 SEALED SOURCE TYPE: Gamma Source SAFETY-ANALYSIS

SUMMARY

(Continued)

Furthermore, we continue to conclude that the Model 4F3B sealed source would be oxpected to maintain its containment integrity for normal cGnditions of use and accidental conditions'which might occur during uses specified in this certificate.

REFERENCES:

The following supporting-documents for the Model 4F3B sealed source are hereby' incorporated by reference and are made a part of'this registry document: 3M Health Physics Services' letters dated August 15, 1991, July 27, 1964, June 4, 1964, and September 10, 1963, with enclosures thereto ISSUING AGENCY: U.S. Nuclear Regulatory Commission Date: January 26. 1996 Reviewer: 06ugla A. Broaddus Date:' January 26. 1996 Concurrence: S'teven L.' Baggett

.a pc nauq [) t UNITED STATES l I j NUCLEAR REGULATORY COMMISSION I s** % * * * * * $j WASHINGTON, D C. 20555 4001 c, February 12, 1996 l NOTE T0: MINNESOTA MINING AND MANUFACTURING (3M) INACTIVE FILES FROM: f l

SUBJECT:

INACTIVATION OF REGISTRATIONS BASED ON AUGUST 6, 1991, LETTER. A number of the background files for the registration certificates requested (by 3M letter dated August 6, 1991) to be made inactive contain limited { information on the products. A search of 3M registration, archive, and 1 license files, and information in NUDOCS was performed to obtain additional information. Also, 3M was contacted to obtain any additional information that j may have been in their files. 3M provided limited additional information concerning these products and indicated that the information provided represented all additional information in their files. Additional information obtained from these sources has been added to the applicable registration files. At the present time, the information contained in the background registration files represents all available information for these products. In addition, a number of these products were originally reviewed and approved by the Atomic Energy Commission (AEC). The reviews performed for these products to make the certificates inactive were based on the information available -the previous reviews and approvals, and the historical use of the products (i.e., reports of failures or design problems, or the lack thereof). In several instances, ) insufficient information was available to perform an adequate safety review. In these instances, the certificates have been reissued based solely on the original AEC review and approval, and no additional safety review was performed. l t i ? Ip. Suq lW -% 4T)7&O9r

..,g w. I ( February 29, 1996 Robert G. Wissink . 3M Health Physics Services 3M Center Bldg. 224-2E-06 St.' Paul, MN 55144-1000

Dear Mr. Wissink:

This letter is in response to your. request dated August 6, 1991, and subsequent-letters, requesting to transfer to inactive status all registration sheets issued to 3M as listed.in the first column of Enclosure 1. We have . transferred the requested certificates to inactive status..The certificate numbers.have been changed as listed in Enclosure 1. Copies of the inactive certificates are enclosed for your records. .Please read over the registration certificates and notify us immediately if j .there are any errors or inconsistencies. If you have any questions, please contact me at (301) 415-5847 or Mr. Steven Baggett at (301) 415-7273. ) Sincerely, 13 l Douglas A. Broaddus, Mechanical Engineer Sealed Source Safety.Section Source Containment and Devices Branch Division of Industrial and Medical Nuclear Safety, NMSS

Enclosures:

As stated l Distribution:- SSSS R/F. NE01 SS0-91-71 Registration certificate files listed in Enclosure 1

DOCUMENT NA.M.E:

C:\\WPDO . - i CS\\.SS.DS\\ INACTIVE \\.NRC\\460INACT. CMP n .. w c. c.,, c.c.,,. - w.u. 0FFICE SCDB lC l l l l l NAME DABroaddus I DATE 02/2P/96 OFFICIAL RECORD COPY ~ i [A Db M

p. ~s,\\

ENCLOSURE 1 REGISTRATIONS TRANSFERRED TO INACTIVE STATUS Old Certificate No. New Certificate No. Model Number (s) NR-459-S-101-S NR-8008-S-801-S 4F6Y NR-459-S-102-S NR-8008-S-802-S 3F1G NR-460-S-101-S NR-0460-S-875-S 4F6D NR-460-S-102-S COMBINED WITH 4F6H, 4F6B NR-0460-S-874-S NR-460-S-103-S NR-0460-S-876-S 4F6G NR-460-S-104-S COMBINED WITH 6D6A NR-0460-S-865-S NR-460-S-105-S NR-0460-S-877-S 6B6F NR-460-S-106-S NR-0460-S-878-S 4F6P NR-460-S-107-S NR-0460-S-879-S 1C2A, 1C28 NR-460-S-108-S NR-0460-S-880-5 4F3B NR-460-S-109-S NR-0460-S-881-S 4F3C NR-460-S-110-S NR-0460-S-882-S 3MIC NR-460-S-111-S NR-0460-S-883-S 3M1B NR-460-S-112-S NR-0460-S-884-S 3E4G NR-460-S-113-S NR-0460-S-885-S 4D3A NR-460-S-114-S NR-0460-S-886-S 4D3B NR-460-S-115-S NR-0460-S-887-S 4D60 NR-460-S-116-S NR-0460-S-888-S 4D6F NR-460-S-117-S NR-0460-S-889-S 5FID NR-460-S-118-S COMBINED INTO 5FIE ~ ~ NR-460-S-119-S 5FIF NR-460-S-120-S NR-0460-S-891-S 5 FIG NR-460-S-121-S NR-0460-S-892-S 3L2B NR-460-S-122-S NR-0460-S-893-S 3L2A NR-460-S-123-S NR-0460-S-894-S 3MIF j. NR-460-S-124-S NR-0460-S-895-S 3L2C i l L___________._________-._____

a ENCLOSURE 1 REGISTRATIONS TRANSFERRED TO INACTIVE STATUS Old Certificate No. New Certificate No. Model Number (s) NR-460-S-125-S NR-0460-S-896-S 1E2J NR-460-S-126-S NR-0460-S-897-S 3F1G NR-460-S-127-S NONE - NO INFORMATION 4FIE AVAILABLE NR-460-S-128-S NR-0460-S-899-S 5F1H NR-460-S-129-S NR-0460-S-900-S 3E40 NR-460-S-130-S COMBINED INTO 5 FIN NR-460-S-131-S NR-0460-S-901-S 5 FIN (MODIFIED) NR-460-S-132-S NR-0460-S-902-S 7B8L NR-460-S-133-S COMBINED INTO 6H6A NR-460-S-134-S ~ ~~ ~ 6H6B NR-460-S-135-S NR-0460-S-904-S 406M l NR-460-S-136-S NR-0460-S-905-S 3L2E NR-460-S-137-S NR-0460-S-906-S 6500, 6520 (FORM. 606C) NR-460-S-138-S NR-0460-S-907-S 3L2D NR-460-S-139-S NR-0460-S-908-S 3Q1D NR-460-S-140-S NR-0460-S-909-S 3E4L, 3E4S NR-460-S-141-S NR-0460-S-910-S 3 FIR NR-460-S-142-S NR-0460-S-911-S 902, 902F, 903 NR-460-S-143-S COMBINED WITH 4P6E NR-0460-S-871-S NR-460-S-144-S COMBINED WITH 4P6M NR-0460-S-872-S l NR-460-S-145-S NR-0460-S-912-S 3 MIL NR-460-S-146-S NR-0460-S-913-S 3G9A NR-460-S-147-S NR-0460-S-914-S 3B4G NR-460-S-148-S COMBINED WITH 4F3F NR-0460-S-871-S I NR-460-S-149-S NR-0460-S-915-S 4F3G I

s ENCLOSURE 1 REGISTRATIONS TRANSFERRED TO INACTIVE STATUS Old certificate No. New Certificate No. Model Number (s) NR-460-S-150-S NR-0460-S-916-S 6DIA NR-460-S-151-S COMBINED WITH 6530, 6540 (FORM. 6B6G) NR-0460-S-869-S NR-460-S-152-5 NR-0460-S-917-S 6H6D NR-460-S-153-S NOT REQUIRED ALBUMIN MICR0 SPHERES NR-460-S-154-S NR-0460-S-919-S 6H6E, 8C9T NR-460-S-155-S COMBINED INTO 406L NR-460-S-156-S ~ ~ ~' 4D6P NR-460-S-158-S NR-0460-S-921-S 3F11, 3F1J, 3FIL NR-460-S-159-S NR-0460-S-922-S 3F1V NR-460-S-160-S COMBINED WITH 4P6T NR-0460-S-873-S NR-460-S-161-S COMBINED INTO 4F3D NR-0460-S-920-S NR-460-S-162-S NR-0460-S-923-S-4F3H NR-460-S-163-S COMBINED INTO 4F6S NR-0460-S-920-S NR-460-S-164-S COMBINED WITH ' 3E40 NR-0460-S-900-S NR-460-S-165-S NR-0460-S-924-S 6701 NR-460-S-166-S NR-0460-S-925-S 6702 NR-460-S-167-S NR-0460-S-926-S 6711 NR-460-S-168-G NR-0460-S-927-G 702, 703, 704' NR-460-S-169-S NR-0460-S-928-S 6510, 6550, 6570 (FORMERLY 6B6G) NR-460-S-170-S NR-0460-S-929-S 4P6V NR-460-S-171-S-NR-0460-S-930-S 4F6ST l 1 I I i

REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALED SOURCE '4 NO : NR-460-S-880-S DATE: January 26, 1996 ATTACHMENT 1 SILVE R BR A Z E,'i- - -fy OR WELD s \\ t. .c (3) r _........... s. L w-e. s. A5 5 E M B LY 1.474 REE -- H De M AT'L. S T. STE E,L 'T YPE 347 l I

REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALED SOURCE l NO,; NR-460-S-880-S DATE: January 26, 1996 ATTACHMENT 1 SILVER BRAZE > - - --q> OR VVECD \\ f. .c (a) /, .......:.=, ,%W., Q,' '\\.' i AS S E M B LY + - -

i. 4 7 4 aes

-n 9 M AT'L. 5 T. STE E,L ' TYPE 347

cc REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALED SOURCE 0 99 NO,: NR-460-S-l-S DATE: PAGE 1 OF 6 SEALED SOURCE TYPE: Gamma Source MODEL: 4F3B MANUFACTURER / DISTRIBUTOR: 3M Health Physics Services 3M Center, Building 224-2E-06 St. Paul, MN 55144-1000 ISOTOPFa MAXIMUM ACTIVITY: Cobalt-60 1.000 curie (37.00 GBq) 1 LEAK TEST FREOUENCY: 6 Months PRINCIPAL USE: (T) Other CUSTOM SOURCE: YES X NO Revision 1, December 2, 1995 G:\\SSSS\\NR460108.SSD .__ -_-_______ - _ _ _ a

REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALCD SOURCE NO.- NR-460-S-1)s-S DATE: PAGE 2 OF 6 SEALED SOURCE TYPE: Gamma Source DESCRIPTION: The 4F3B is a doubly-encapsulated sealed source. Cobalt-60 is absorbed into small ceramic particles ranging from 0.001-0.008 in. (30-200 microns) in diameter. The isotope is then permanently fixed to the ceramic particles using a heat treatment to create 3M Brand Radiating Microspheres. The microspheres are encased in a 0.742 in. (1.885 cm) long, 0.499 in. (1.267 cm) outer diameter, 0.375 in. (0.953 cm) inner diameter inner capsule with a wall across one end which has an average thickness of 0.063 in. (0.160 cm). After the microspheres are inserted, a 0.375 in. (0.953 cm) nominal diameter, 0.125 in. (0.318 cm) thick inner plug is inserted into the inner capsule and silver brazed in place, sealing the microspheres inside. The entire inner assembly is then inserted, plug-end first, into a 1.000 in. (2.540 cm) long, 0.750 in. (1.905 cm) outer diameter, 0.500 in. (1.270 cm) nominal inner diameter outer capsule with a 0.125 in. (0.318 cm) thick wall across one end. A 0.500 in. (1.270 cm) average diameter, 0.125 in. (0.318 cm) thick outer plug with a 0.500 in. (1.270 cm) long threaded stud extending from it is inserted, with the stud facing out, into the outer capsule and heliarc welded in place, sealing the inner assembly inside. The completed Model 4F3B source is 1.474 in. (3.744 cm) long (including the threaded stud) with a maximum diameter of 0.750 in. (1. 905 cm). Both capoules and both plugs are made from type 347 stainless steel. DIAGRAM: See Attachment 1 i 1 l Revision 1, December 2, 1995 G:\\SSSS\\NR460108.SSD

REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALED SOURCE NO.: NR-460-S-{yg-S DATE: PAGE 3 OF 6 SEALED SOURCE TYPE: Gamma Source LABELING: Depending upon the and use of this source, either the following information was engraved on the exterior of the outer capsule or a permanent-type label containing the information presented below plus the radiation symbol was affixed to the exterior of the outer capsule. Caution Radioactive Material XXX millicuries Co-60 Serial No. XXX Model 4F3B Date 3M Company CONDITIONS OF NORMAL USE: The source was designed to be used in applications where a high-integrity gamma source is required, particularly where extreme environmental conditions exist. PROTOTYPE TESTING: The following tests were performed on prototype models of this source. After each test, the source was wipe tested and leak tested. The wipe tests were counted in a detection instrument capable of detecting less than 0.0001 pCi (3.700 Bq) of removable cobalt-60. The leak tests were performed by immersing the source for a minimum of 10 seconds in water at 200*F (93.33 C) and observing any bubbles generated. All leak tests were negative. 1. Heat test - Heat the source at 1,832 F (1,000*C) for 30 minutes. 2. Ouench test - Quench the source from 1,832*F (1,000'C) to the temperature of cold water.

3. Molten lead test - Immerse the source in molten lead at 932 F (500'C) for 30 minutes.

Revision 1, December 2, 1995 G:\\SSSS\\NR460108.SSD

REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALED SOURCE NO,: NR-460-S-108-S DATE: PAGE 4 OF 6 SEALED SOURCE TYPE: Gamma Source PROTOTYPE TESTING: (Continued) 4. Impact test - Drop a weight generating 2 ft-lb on the sides of the source at two points 180 apart and on each end, performing the test 20 times on each point. EXTERNAL RADIATION LEVELS: External radiation dose rates were calculated for a 1.000 Ci (37.00 GBq) Co-60 source. The dose rates are based on an NIST traceable standard and are as follows: Distance Maximum Radiation Level (from surface) (cm) (in) (R/hr) (Sv/hr) 5 1.97 538 5.38 30 11.81 14.7 0.147 100 39.37 1.35 0.014 OUALITY ASSURANCE AND CONTROL: The following quality control procedures were followed during production of this source:

1. After the inner plug was silver brazed in place, the inner capsule was cleaned until wipe tests revealed less than 0.0005 Ci (18.50 Bq) of removable Cs-137 contamination.
2. After the outer plug was silver brazed or welded in place, the source was wipe tested.

If the wipe revealed greater then 0.0001 Ci (3.700 Bq), the source was cleaned until the 0.0001 pCi (3.700 Bq) wipe test limit was reached. Revision 1, December 2, 1995 Gr\\SSSS\\NR460108.SSD

REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALED SOURCE NO,: NR-460-S-108'-S DATE: PAGE 5 OF 6 SEALED SOURCE TYPE: Gamma Source OUALITY ASSURANCE AND CONTROL: (Continued)

3. The source was stored for 7 days and wipe tested again.

If this wipe test revealed greater than 0.0001 pCi (3.700 Bq) of removable Cs-137 contamination, the source was rejected.

4. The source was wipe tested again prior to shipment.

This wipe test also had to reveal less than 0.0001 pCi (3. 700 Bq) of removable Cs-137 contamination. LIMITATIONS AND/OR OTHER CONSIDERATIONS OF USE:

  • This source may be used only by persons specifically licensed by the NRC or an Agreement State.
  • Handling, storage, use, transfer, and disposal:

to be determined by the licensing authority.

  • This source shall be leak tested at intervals not to exceed 6 months using techniques capable of detecting 0.005 microcurie (185.0 Bq) of removable contamination.
  • This registration sheet and the information contained within the references shall not be changed without the written consent of the NRC.

SAFETY ANALYSIS

SUMMARY

The Model 4F3B sealed source is not a current product manufactured or distributed by 3M Health Physics Services. However, 3M Health Physics Services will continue to receive 4F3B sources for disposal. Based on our review of the Model 4F3B sealed source, and the information and test data cited below, we continue to conclude that this sealed source is acceptable for specific licensing purposes. Revision 1, December 2, 1995 G:\\SSSS\\NR460108.SSD

REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALED SOURCE NO ; NR-4 6 0 -S -[iO8l-S DATE: PAGE 6 OF 6 SEALED SOURCE TYPE: Gamma Source SAFETY ANALYSIS

SUMMARY

(Cont inued_)_

Furthermore, we continue to conclude that the Model 4F3B sealed source would be expected to maintain its containment integrity for normal conditions of use and accidental conditions which might occur during uses specified in this certificate.

REFERENCES:

The following supporting documents for the Model 4F3B sealed source are hereby incorporated by reference and are made a part of this registry document:

  • 3M Health Physics Services' letters dated August 15, 1991, July 27, 1964, June 4, 1964, and September 10, 1963, with enclosures thereto ISSUING AGENCY:

U.S. Nuclear Regulatory Commission Date: Reviewer: Thomas W. Rich Date: Concurrence: Steven L. Baggett Revision 1, December 2, 1995 G:\\SSSS\\NR460108.SSD i l b

-s REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALED SOURCE NO,: NR-460-S-[0Bj-S DATE: ATTACHMENT 1 Revision 1, December 2, 1995 G:\\SSSS\\NR460108.SSD l

REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALED SOURCE NO : NR-460-S-108'-S DATE: PAGE 1 OF 6 SEALED SOURCE TYPE: Gamma Source MODEL: 4F3B MANUFACTURER / DISTRIBUTOR: 3M Health Physics Services 3M Center, Building 224-2E-06 St. Paul, MN 55144-1000 ISOTOPE: MAXIMUM ACTIVITY: Cobalt-60 1 curie (37 GBq) LEAK TEST FREOUENCY: 6 Months I ) I PRINCIPAL'USE: (T) Other CUSTOM SOURCE: YES X NO o

_ = _ _ _ REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALED SOURCE NO : NR-460-S-%08-S DATE: PAGE 2 OF 6 . SEALED SOURCE TYPE: Gamma Source DESCRIPTION: 'The 4F3B is a doubly-encapsulated sealed source. Cobalt-60 is absorbed-into small ceramic. particles ranging from 30 - 200 microns in diameter. The isotope is then permanently fixed to the. ceramic particles using a heat treatment to create 3M Brand Radiating Microspheres. The microspheres are encased in an inner capsule measuring 0.742 in. (1.885 cm) in length with a 0.499 in. (1.2671cm) diameter. A welding plug measuring 0.375 in. (0.953 cm) in diameter and 0.125 in. (0.318 cm) thick is silver brazed into the opening of the inner capsule, sealing the microspheres inside. The inner capsule is then inserted, plug-end first, into an outer capsule 1 in. (2.54 cm) long with.a diameter of 0.75 in. (1.905 cm). A second welding plug is inserted into the outer capsule and heliarc welded in~ place to seal the inner capsule and radioactive material inside. The second welding plug has a threaded stud extending out 0.5 in. (1.27 cm) from. its surf ace. All capsules and plugs are. fabricated from type-347 stainless steel. The overall-dimensions.of the-finished 4F3B sealed source are 1.474 in. -(3.743 cm) long with a diameter of 0.75 in. (1.905 cm). DIAGRAM: See Attachment 1. LABELING: Depending upon 'he.end use of this source, either the following t information was engraved on the exterior of the outer = capsule or a permanent-type label containing the information presented below plus-the radiation symbol was affixed to the exterior of the outer capsule. Caution Radioactive Material XXX millicuries Co-60 l Serial No. XXX Model 4F3B Date 3M Company u___________.______________

a e .O ~ REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALED SOURCE NO,: NR-460-S-108-S DATE: PAGE 3 OF 6 SEALED SOURCE TYPE: Gamma Source CONDITIONS OF NORMAL USE: The source was designed to be used in applications where a high-integrity gamma source is required, particularly where extreme environmental conditions are involved. PROTOTYPE TESTING: The following tests were performed on prototype models of this source. After each test the source was wipe tested and leak tested. The wipe tests were counted in a detection instrument capable of detecting less than 0.0001 Ci (3.7 Bq) of removable cobalt-60. The leak tests'were performed by immersing the source for a minimum of 10 seconds in water at 200 F (93.33 C) and observing any bubbles generated. All leak tests were negative. 1. Heat test - Heat the source at 1,832 F (1,000'C) for 30 minutes. 2. Ouench test - Quench the source from 1,832*F (1,000oC) to cold water. 3. Molten lead test - Immerse the source in molten lead at 932 F (500oC) for 30 minutes. 4. Imoact test - Drop a weight generating 2 ft-lb on the sides of the source at two points 180* apart and on each end, performing the test 20 times on each point.

e s REGISTRY'OF' RADIOACTIVE-SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALED SOURCE- 'l NO.:.NR-460-S-108-S DATE: PAGE 4 OF 6 ~ SEALED SOURCE TYPE: Gamma Source (p - fo O S O M EXTERNAL RADIATION LEVELS: NY x External r iat*o ose rates were calculated for-a 1.0 Ci -(37 GBq) Cs-1 1 source. The. dose rates are based on an NIST traceabl standard and are as follows: Distance-Maximum Radiation Level .(from surface)- {d ht (cm) (in) (R/hr) (Sv/hr) g $S 5 1.97 132 1.32-30 11.81 3.7 0.037 U 100 39.37 0.33 0.003 OUALITY ASSURANCE AND CONTROL: The following quality; control procedures were followed during production of this source:

1. After the inner plug was silver. brazed in place, the inner capsule was cleaned until wipe tests revealed less than 0.0005 pCi (18.5 Bq): of removable Cs-137 contamination.
2. After the outer. plug was' silver' brazed or wel'ded in place, the source was' wipe tested.

If the wipe revealed greater then 0.0001 pCi (3,7 Bq), thesourcewascleaneduntilthe'g( 3 0.0001 pCi (gg{})GTwipetest limit was reached.

3. The source was stored for 7 days and wipe tested again.

If this wipe test revealed' greater than 0.0001 Ci. (3. 7 Bq) of removable Cs-137 contamination, the source was rejected. 4. The source was wipe tested again prior to shipment. This wipe test also had to' reveal'less than 0.0001 Ci (3.7 Bq) of removable Cs-137. contamination.

REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALED SOURCE NO.- NR-460-S-108-S DATE: PAGE 5 OF 6 SEALED SOURCE TYPE: Gamma Source LIMITATIONS AND/OR OTHER CONSIDERATIONS OF USE:

  • This source (55A2been distributed only to persons y

specifically licensed by the NRC or an Agreement State.

  • Handling, storage, use, transfer, and disposal:

to be determined by the licensing authority.

  • This source shall be leak tested at intervals not to exceed 6 months using techniques capable of detecting 0.005 microcurie (185 Bq) of removable contamination.
  • This registration sheet and the information contained within the references shall not be changed without the written consent of the NRC.

SAFETY ANALYSIS

SUMMARY

The Model 4F3B sealed source is not a current product manufactured or distributed by 3M Health Physics Services. However, 3M Health Physics Services will continue to receive 4F3B sources for disposal. Based on our review of the Model 4F3B sealed source, and the information and test dat.Acited below, we continue to conclude that this sealed source wab]peceptable for specific licensing purposes. s a) Furthermore, we continue to conclude that the Model 4F3B sealed source would be expected to maintain its containment integrity for normal conditions of use and accidental conditions which might occur during uses specified in this certificate.

REFERENCES:

i The following supporting documents for the Model 4F3B sealed l source are hereby incorporated by reference and are made a part of this registry document:

  • 3M Health _Ehy ics Services' letters dated August 15, 1991, (7~?anuary 9, 1990, July 27, 1964, June 4, 1964, and September 10, 1963,~ Wit enclosures thereto wNe'a Y5\\eN 1

l

( REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALED SOURCE NO,- NR-460-S-108,-S DATE: PAGE 6 OF 6 SEALED SOURCE TYPE: Gamma Source ISSUING AGENCY: U.S. Nuclear Regulatory Commission Date: Reviewer: Thomas W. Rich Date: Concurrence: Steven L. Baggett j

l j r t l, REGISTRY OF RADIOACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF SEALED SOURCE l NO,: NR-460-S-108-S DATE: ATTACHMENT 1 4 l s 6 l l l l l l l

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