Regulatory Guide 4.13: Difference between revisions

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{{Adams
{{Adams
| number = ML003739935
| number = ML13350A201
| issue date = 07/31/1977
| issue date = 11/30/1976
| title = Performance,Testing & Procedural Specifications for Thermoluminescence Dosimetry:Environmental Applications
| title = Performance, Testing, and Procedural Specifications for Thermoluminescence Dosimetry: Environmental Applications
| author name =  
| author name =  
| author affiliation = NRC/RES
| author affiliation = NRC/RES
Line 10: Line 10:
| license number =  
| license number =  
| contact person =  
| contact person =  
| document report number = RG-4.13 Rev 1
| document report number = RG-4.013
| document type = Regulatory Guide
| document type = Regulatory Guide
| page count = 4
| page count = 2
}}
}}
{{#Wiki_filter:U.S. NUCLEAR REGULATORY  
{{#Wiki_filter:U.S. NUCLEAR REGULATORY  
COMMISSION  
COMMISSION
July REGULATORY  
November 1976 REGULATORY  
GUIDE OFFICE OF STANDARDS  
GUIDE OFFICE OF STANDARDS  
DEVELOPMENT  
DEVELOPMENT
REGULATORY  
REGULATORY  
GUIDE 4.13 PERFORMANCE, TESTING, AND PROCEDURAL  
GUIDE 4.13 PERFORMANCE, TESTING, AND PROCEDURAL  
SPECIFICATIONS  
SPECIFICATIONS
FOR THERMOLUMINESCENCE  
FOR THERMOLUMINESCENCE  
DOSIMETRY:  
DOSIMETRY:
ENVIRONMENTAL  
ENVIRONMENTAL  
APPLICATIONS
APPLICATIONS


==A. INTRODUCTION==
==A. INTRODUCTION==
Section 20.105, "Permissible levels of radiation in unrestricted areas," of 10 CFR Part 20, "Standards for Protection Against Radiation," provides limits on levels of radiation in unrestricted areas resulting from possession, use, or transfer of NRC-licensed radioac tive material.
Section 20.105, "Permissible levels of radiation in unrestricted areas." of 10 CFR Part 20. "Standards for Protection Against Radiation." provides limits on levels of radiation in unrestricted areas resulting from possession, use. or transfer or NRC-licensed radioac-tive material.


Section 20.201, "Surveys," of 10 CFR Part 20 further requires that a licensee conduct sur veys as may be necessary to comply with the regula tions of 10 CFR Part 20 including, when appropriate, the measurement of levels of radiation.
Section 20.106, "Radioactivity in ef-fluents to unrestricted areas," of 10 CFR Part 20 prohibits a licensee from releasing to an unrestricted area radioactive materials in concentrations that ex-ceed limits specified in 10 CFR Part 20 except as otherwise authorized in a license issued by the Com-mission. Section 20.201. "Surveys." of 10 CFR Part result of normal operations.


Paragraph IV.B(2) of Appendix I, "Numerical Guides for Design Objectives and Limiting Condi tions for Operation to Meet the Criterion
including anticipated operational occurrences, and .s 'the result of postulated accidents."hernioluninescence dcs!m'§krp (TlD) is widely used to measure levels o ~fý4X`d-gnnia radiation in the environs of NRC41icenkd nui61iear facilities.
'As Low As Is Reasonably Achievable'
for Radioactive Material in Light-Water-Cooled Nuclear Power Reactor Ef fluents," to 10 CFR Part 50, "Licensing of Produc ,, tion and Utilization Facilities," requires that licensees establish appropriate surveillance and monitoring programs to provide data on measurable levels of radiation and radioactive materials in the en vironment.


General Design Criterion
This guide provides miniimuni acceptable performance criteria for TLD.sysirns used for this purpose. It also provides proeederes f-caibration, field application.
64, "Monitoring radioactivity releases," of Appendix A, "General Design Criteria for Nuclear Power Plants," to 10 CFR Part 50 requires that nuclear power plant designs provide means for monitoring the plant en virons for radioactivity that may be released as the result of normal operations, including anticipated operational occurrences, and as the result of postulated accidents.


Thermoluminescence dosimetry (TLD) is widely used to measure levels of X and gamma radiation in the environs of NRC-licensed nuclear facilities.
and reporting,-\'" ;\ ,


This guide provides minimum acceptable performance criteria for TLD systems used for this purpose. It also provides procedures for calibration, field application, and reporting.
====l. DISCUSSION====
20 further requires that a licensee conduct surveys as, Wikjbg Gioup 9 of the Health Physics Society may be necessary to comply with the regulations of Z',`. nd,4.rdiý1Committee for American National Stan-10 CFR Part 20 including, when appropriate, the ain Committee (ANSI) N13 on Radiation measurement of levels of radiation.


It does not apply to TLD systems used for the purpose of determining occupational ex posure.
,. .Plection has prepared a standard that specifies acceptable performance of TLDs used for Section IV.B of Appendix I, "Numerical G1.4 s mt'asurements:
outlines methods to for Design Objectives and Limiting Cor04ti'iohs gy test for compliance:
and provides procedures for Operation to Meet the Criterion
'As A.0ow A Is calibration, field application, and reporting.


==B. DISCUSSION==
This Reasonably Achievable'
Working Group 9 of the Health Physics Society Standards Committee for American National Stan dards Institute (ANSI) Committee N 13 on Radiation Protection has prepared a standard that specifies minimum acceptable performance of TLDs used for environmental measurements;
for Radioactivea eri4l in standard was prepared under the direction of the Light-Water-Cooled Nuclear Power Re'tGOP"Ef- Health Physics Society Standards Committee and fluents." to 10 CFR Part 50, "Licensing of Produc- was processed and approved for submittal to ANSI tion and Utilization requires that by the American National Standards Committee on licensees establish appr fi- surveillance and Radiation Protection.
outlines methods to test for compliance;
and provides procedures for calibration, field application, and reporting.


This standard was approved by the N13 Committee.
NI1. It was subsequently ap-monitoring programs to on measurable proved and designated N545-1975 by the ANSI levels of radiation a io i.e materi,fls in the en- Board of Standards Review on August 20. 1975.1 vironment, General i *iW ion 64, "Monitoring radioactivit e es, of' Appendix A, "General Design Crite or Nuclear Power Plants," to 10 CFR Part 50 uires that nuclear power plant designs provide means for monitoring the plant en-virons for radioactivity that may be released as the The specification of performance criteria of ther-moluminescence dosimetry and the verification of the actual performance require appropriate statistical
'ANSI N545-1975, "P'erfornmance.


It was subsequently approved and designated N545 1975, by ANSI on August 20, 1975.1 The specification of performance criteria of ther moluminescence dosimetry and the verification of the actual performance require appropriate statistical concepts and techniques.
Testing. and Procedural Spcificalion Fir Th,:rlnoluminesrencrt:
Dou.imetry (Envirdnniciltal Applications)'" moly he (iblaind From the Americain Naliontal Standards Inslilttul.


Because wide applicability is intended, ANSI N545-1975 as well as the provi sions and clarifications given below in the regulatory position are confined to simple statistical concepts and prescribe no specific statistical techniques.
1430 Bro:dway, New York. New Yoirk t(X)IX.USNRC REGULATORY
GUIDES Comments should be sent to the Secretary of the Commission.


In fact, the implementation of some specifications by rigorous statistical methods may prove difficult for some users of the guide. Therefore, good approx imate statistical methods are acceptable.
U.S. Nuclea, Regulatory Guides are issued to describe and make available to the public ARgulatoty Commission.


* Lines indicate substantive changes from previous issue.  'ANSI N545-1975, "Performance, Testing, and Procedural Specification for Thermoluminescence Dosimetry (Environmental Applications)" may be obtained from the American National Standards Institute, 1430 Broadway, New York, New York 10018.I*USNRC REGULATORY
Washington.
GUIDES Comments should be sent to the Secretary of the Commission, US. Nuclear Regu latory Commission, Washington, D.C. 20555. Attention:
Docketing and Service Regulatory Guides are issued to describe and make available to the public methods Branch.  acceptable to the NRC staff of implementing specific parts of the Commission's regulations, to delineate techniques used by the staff in evaluating specific problems The guides are issued in the following ten broad divisions or postulated accidents, or to provide guidance to applicants.


Regulatory Guides are not substitutes for regulations, and compfiance with them is not required.
0 C 2055, Attention Docketlrg and Asguatoy Gudearei~sud t decrib An mae anitate o th pul'c Serivice Section methods acceptable to ihe. IRC staff of implementing sppcihic pe'-t.of ine S Se*tion Commission's regulations, to delineate techniques used by the staf.f i eyrelu 1he guide% are issued in the following ten broad divi.iolls sting specific problems or postulated accidents Ot to provide guidrnce to apphi cants. Regulatory Guides ate not substitutes tot regulations, and compliance I Power Reactors 6 Piuducls with them is not required Methods and solutions dliffelrent from those set on't in 2. Research and Test Reactors I Ttanspocietlnn the guides wilt be acceptable if they provide a basis lot the findings teqwus.te to 3 Fuels and Matetials Facilities
8 Uccupational Heallh the isr.ance or conlinuance ola permit or license by the Commission
4 EnvlronmentAlend Siling 9 Antitiust Review Comments and suggestions fot improvements in these guides ate encouraged
6 Matetials arid Plant Protection
10 General at all times, and guides will be revised, as appropriate, to accommodate com meits and to reflect new information or eopetience However. comnitnts on Copies of published guides may be obtained by written request indrcatirrg the this guide, io received within abuul two nmonths after its issuance, will be part divisions desired to the U S Nuclear Regulatory Conintlision.


1. Power Reactors 6. Products Methods and solutions different from those set out in the guides will be accept- 2. Research and Test Reactors 7. Transportation able if they provide a basis for the findings requisite to the issuance or continuance
Washingtonr.
4. Environmental and Siting 9. Antitrust Review of a permit or license by the Commission.


5. Materials and Plant Protection
0 f ticultaly useful in evaluatrng the need for art early revision 205. Attention ODrector.
10. General Comments and suggestions for improvements in these guides are encouraged at all Requests for single copies of issued guides (which may be reproduced)
or for place times, and guides will be revised, as appropriate, to accommodate comments and ment on an automatic distribution list for single copies of future guides in specific to reflect new information or experience.


This guide was revised as a result of divisions should be made in writing to the US. Nuclear Regulatory Commission, substantive comments received from the public and additional staff review, Washington, D.C. 20555, Attention Director.
Office of Standards Development concepts and techniqu,.-s.


Oivision of Document Control Revision 1 1977 No specific criteria for good approximation are prescribed.
Because w!de applicability is intended.


However, the user should judge whether the sample size is adequately large for the approxima tion and whether the distribution of the measure ments is sufficiently close to that assumed in the analysis.
ANSI N545. 1975 as well as the provi-sions and clarifications given below in the regulatory position are confined to simple statistical concepts and prescribe no specific statistical techniques.


Problems relating to underlying distribu tions can be avoided by the use of nonparametric methods. Some of the specifications that are stated in terms of standard deviations can be reformulated in nearly equivalent specifications for tolerance limits for which simple nonparametric methods are available.
In fact. the implem-.-ntation of some specifications by rigorous statistical methods may prove difficult for some users of the guide. Therefore, good approx-imate statistical methods are acceptable.


Such reformulations are also acceptable.
No specific criteria for good approximation are prescribed.


A. Hald 2 and W. J. Conover 3 are useful reference sources for parametric and nonparametric methods, respectively.
However. the user should judge whether the sample site is adequately large for the approxima- tion and w%+-ether the distribution of the measure-m'ents is sutfiiently close to that assumed in the analysis.


If every TLD is individually calibrated, the popula tion parameters for certain errors can be computed directly, and statistical inference is not needed for specifications relating to these errors.  Comments received on this guide and subsequent discussions of these comments have indicated a need for the following emphasis on, or clarification of, sec tions of the guide and ANSI N545-1975 in order to avoid misinterpretations:
Pr(.blems relating to underlying distribu-tions can he 'tvoided by the use of nonparametric methods Some .-f the specifications which are stated in terms of standard deviations can be reformulated in nearly equivalent specifications for tolerance limits for %%hich simple nonparametric methods are available.
a. In this guide, the expression environs of NRC licensed facilities includes both the term environment as defined in ANSI N545-1975 and the phrase un restricted areas as defined in 10 CFR Part 20.  b. In Section 2, "Definitions," of ANSI N545 1975, the distinction between thermoluminescence dosimeter (TLD) and thermoluminescence (TL) phosphor should be noted. As defined in ANSI N545 1975, a TLD can, and usually does, contain multiple TL phosphors or. otherwise provides for multiple readings of the exposure.


When multiple readings are used for the measurement of the response of a TLD, that response is an average of the individual readings.
Such reformulations are also acceptable.
 
ANSI N545-1975 refers to these average values rather than to the individual readings.


c. Regulatory position 3 of this guide and Section 3.3 of ANSI N545-1975 refer to the overall error in the total field exposure.
A. [Iaid: and WV. J. Conover' are useful reference sources for parametric and nonparametric methods.respectively.


No method is specified for interpreting field exposures to isolate contributions attributable to a nuclear facility, and no limit is specified on the error associated with estimates of the exposure attributable to the facility.
If every TLD i; individually calibrated, the popula-tion parameters for certain errors can be computed directly, and statistical inference is not needed for specifications relating to these errors.C. REGULATORY
POSITION The requirements and recommendations for per-formance specifications.


d. Section 6.3.1 of ANSI N545-1975 specifies field exposure at a height of 1 meter above the ground; however, Section 6.3.3 permits exposure at other heights.
testing procedures.


2A. Hald, Statistical Theory with Engineering Applications, John Wiley & Sons, Inc., 1952.  3W.J. Conover, Practical Nonparametric Statistics, John Wiley & Sons, Inc., 1971.e. Section 7.2 of ANSI N545-1975 permits the re quirements of Section 4 of the standard to be satisfied by reference to prior documents.
calibra-tion procedures, field procedures, and reporting procedures that are included in ANSI N545-1975 are generally acceptable to the NRC staff as the basis for using thermoluminescence dosimetry for the measurement of X and gamma: radiation in the en-virons of NRC-licensed facilitir:.-
subject to the fol-lowing additional provisiu.is
:J qualificati~ms.


Test results provided by vendors are examples of such docu ments. Therefore, when requirements of Section 4 of the standard can be met by reference to test results provided by a vendor or other source, additional tests by a licensee are not needed. f. The appendixes to ANSI N545-1975 are not a part of the ANSI standard or of this regulatory guide, which endorses the standard.
1. Section 3. -IPerforma..,e Specifications." of ANSI N 545-1975 should bt' cupplemented by the fol-lowing statement: "Each pt rformance specification shall be verified at the 95% confidence level." A. [laid. Stati.;tical "lhior'v 'ith Eiginierint
..lpplicatimts.


However, the appen dixes do provide useful information on the topics covered.
John k\\ e% & sons. Inc.. 1t52.'\%. J. (d'ono.er.


C. REGULATORY
Iracci .\'operait,'tri .ttijis. John Wiley &sn.qo, Inc.. I19T1.2. Instead of Section 3.1 of ANSI N545-1975, the following should be used: "The performance of the TLD system shall be determined under laboratory conditions and in a known radiation field with an ex-posure equal to that resulting from an exposure rate of 10 p R/hr during the field cycle. Ninety-five per-cent of the measurements shall fall within 10% of the known exposure." 3. Instead of Section 3.3 of ANSI N545-1975, the following should be used: "Ninety-five percent of the final value-:- (after all appropriate corrections to the measurements are applied, including those for errors expect.d under field conditions)
POSITION The requirements and recommendations for per formance specifications, testing procedures, calibra tion procedures, field procedures, and reporting procedures that are included in ANSI N545-1975 are generally acceptable to the NRC staff as the basis for using thermoluminescence dosimetry for the measurement of X and gamma radiation in the en virons of NRC-licensed facilities subject to the fol lowing additional provisions and qualifications.
shall differ from the correct value by less than 30% of the correct value." 4. Instead of Section 4.3.1 of ANSI N545-1975.


1. Section 3, "Performance Specifications," of ANSI N545-1975 should be supplemented by the fol lowing statement: "Subsection
the folLwing should be used: "Uniformity shall be determined by giving TLDs from the same batch an exposure equal to that resulting from an exposure rate of 10 a R/hr during the field cycle. The response obtained shall have a relative standard deviation (coefficient of variation)  
4.2.4 shall apply also to the subsections
of less than 7.5%." 5. Instead of Section 4.3.2 of ANSI N545-1975, the following should be used: "Reproducibility shall be determined by givinL- one TLD repeated exposures equal to that resulting from an exposure rate of 10 p R/hr during the field cycle. The responses shall have a relative standard deviation (coefficient of variation)  
3.1 and 3.3." 2. Instead of Section 3.1 of ANSI N545-1975, the following should be used: "The performance of the TLD system shall be determined under laboratory conditions and in a known radiation field with an ex posure equal to that resulting from an exposure rate of 101MR/hr during the field cycle. Ninety-five per cent of the measurements shall fall within 10% of the known exposure." 3. Instead of Section 3.3 of ANSI N545-1975, the following should be used: "Ninety-five percent of the final values (after all appropriate corrections to the measurements are applied, including those for errors expected under field conditions)
of less than 3.0%."-
shall differ from the correct value by less than 30% of the correct value." 4. Instead of Section 4.3.1 of ANSI N545-1975, the following should be used: "Uniformity shall be determined by giving TLDs from the same batch an exposure equal to that resulting from an exposure rate of lOtR/hr during the field cycle. The response obtained shall have a relative standard deviation (coefficient of variation)  
of less than 7.5%." 5. Instead of Section 4.3.2 of ANSI N545-1975, the following should be used: "Reproducibility shall be determined by giving one TLD repeated exposures equal to that resulting from an exposure rate of 10 juR/hr during the field cycle. The responses shall have 4.13-2 a relative standard deviation (coefficient of variation)  
of less than 3.0%."  


==D. IMPLEMENTATION==
==D. IMPLEMENTATION==
The purpose of this section is to provide informa tion to applicants and licensees regarding the NRC staff's plans for using this regulatory guide.This guide reflects current NRC staff practice.
The purpose of this section is to provide inrorma-tion to applicants and licensees regarding the staffs plans for utilizing this regulatory guide.Except in those cases in which the applicant proposes an acceptable alternative method for com-plying with specified portions of the Commission's regulations, the method described herein will be used in the evaluation of operating license applications docketed after July 15, 1977.If an applicant wishes to use this regulatory guide in developing submittals for applications docketed on or before July 15. 1977, the pertinent portions of the application will be evaluated on the basis of this guide.4.13-2}}
 
Therefore, except in those cases in which the appli cant or licensee proposes an acceptable alternative method, the staff is using and will continue to use the method described herein in evaluating an applicant's or licensee's capability for and performance in com plying with specified portions of the Commission's regulations until this guide is revised as a result of suggestions from the public or additional staff review.4.13-3 I
UNITED STATES NUCLEAR REGULATORY
COMMISSION
WASHINGTON, D. C. 20555 OFFICIAL BUSINESS PENALTY FOR PRIVATE USE, $300 POSTAGE AND FEES PAID U.S. NUCLEAR REGULATORY
COMMISSION}}


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Revision as of 13:59, 17 September 2018

Performance, Testing, and Procedural Specifications for Thermoluminescence Dosimetry: Environmental Applications
ML13350A201
Person / Time
Issue date: 11/30/1976
From:
Office of Nuclear Regulatory Research
To:
References
RG-4.013
Download: ML13350A201 (2)
v • d • e


U.S. NUCLEAR REGULATORY

COMMISSION

November 1976 REGULATORY

GUIDE OFFICE OF STANDARDS

DEVELOPMENT

REGULATORY

GUIDE 4.13 PERFORMANCE, TESTING, AND PROCEDURAL

SPECIFICATIONS

FOR THERMOLUMINESCENCE

DOSIMETRY:

ENVIRONMENTAL

APPLICATIONS

A. INTRODUCTION

Section 20.105, "Permissible levels of radiation in unrestricted areas." of 10 CFR Part 20. "Standards for Protection Against Radiation." provides limits on levels of radiation in unrestricted areas resulting from possession, use. or transfer or NRC-licensed radioac-tive material.

Section 20.106, "Radioactivity in ef-fluents to unrestricted areas," of 10 CFR Part 20 prohibits a licensee from releasing to an unrestricted area radioactive materials in concentrations that ex-ceed limits specified in 10 CFR Part 20 except as otherwise authorized in a license issued by the Com-mission. Section 20.201. "Surveys." of 10 CFR Part result of normal operations.

including anticipated operational occurrences, and .s 'the result of postulated accidents."hernioluninescence dcs!m'§krp (TlD) is widely used to measure levels o ~fý4X`d-gnnia radiation in the environs of NRC41icenkd nui61iear facilities.

This guide provides miniimuni acceptable performance criteria for TLD.sysirns used for this purpose. It also provides proeederes f-caibration, field application.

and reporting,-\'" ;\ ,

l. DISCUSSION

20 further requires that a licensee conduct surveys as, Wikjbg Gioup 9 of the Health Physics Society may be necessary to comply with the regulations of Z',`. nd,4.rdiý1Committee for American National Stan-10 CFR Part 20 including, when appropriate, the ain Committee (ANSI) N13 on Radiation measurement of levels of radiation.

,. .Plection has prepared a standard that specifies acceptable performance of TLDs used for Section IV.B of Appendix I, "Numerical G1.4 s mt'asurements:

outlines methods to for Design Objectives and Limiting Cor04ti'iohs gy test for compliance:

and provides procedures for Operation to Meet the Criterion

'As A.0ow A Is calibration, field application, and reporting.

This Reasonably Achievable'

for Radioactivea eri4l in standard was prepared under the direction of the Light-Water-Cooled Nuclear Power Re'tGOP"Ef- Health Physics Society Standards Committee and fluents." to 10 CFR Part 50, "Licensing of Produc- was processed and approved for submittal to ANSI tion and Utilization requires that by the American National Standards Committee on licensees establish appr fi- surveillance and Radiation Protection.

NI1. It was subsequently ap-monitoring programs to on measurable proved and designated N545-1975 by the ANSI levels of radiation a io i.e materi,fls in the en- Board of Standards Review on August 20. 1975.1 vironment, General i *iW ion 64, "Monitoring radioactivit e es, of' Appendix A, "General Design Crite or Nuclear Power Plants," to 10 CFR Part 50 uires that nuclear power plant designs provide means for monitoring the plant en-virons for radioactivity that may be released as the The specification of performance criteria of ther-moluminescence dosimetry and the verification of the actual performance require appropriate statistical

'ANSI N545-1975, "P'erfornmance.

Testing. and Procedural Spcificalion Fir Th,:rlnoluminesrencrt:

Dou.imetry (Envirdnniciltal Applications)'" moly he (iblaind From the Americain Naliontal Standards Inslilttul.

1430 Bro:dway, New York. New Yoirk t(X)IX.USNRC REGULATORY

GUIDES Comments should be sent to the Secretary of the Commission.

U.S. Nuclea, Regulatory Guides are issued to describe and make available to the public ARgulatoty Commission.

Washington.

0 C 2055, Attention Docketlrg and Asguatoy Gudearei~sud t decrib An mae anitate o th pul'c Serivice Section methods acceptable to ihe. IRC staff of implementing sppcihic pe'-t.of ine S Se*tion Commission's regulations, to delineate techniques used by the staf.f i eyrelu 1he guide% are issued in the following ten broad divi.iolls sting specific problems or postulated accidents Ot to provide guidrnce to apphi cants. Regulatory Guides ate not substitutes tot regulations, and compliance I Power Reactors 6 Piuducls with them is not required Methods and solutions dliffelrent from those set on't in 2. Research and Test Reactors I Ttanspocietlnn the guides wilt be acceptable if they provide a basis lot the findings teqwus.te to 3 Fuels and Matetials Facilities

8 Uccupational Heallh the isr.ance or conlinuance ola permit or license by the Commission

4 EnvlronmentAlend Siling 9 Antitiust Review Comments and suggestions fot improvements in these guides ate encouraged

6 Matetials arid Plant Protection

10 General at all times, and guides will be revised, as appropriate, to accommodate com meits and to reflect new information or eopetience However. comnitnts on Copies of published guides may be obtained by written request indrcatirrg the this guide, io received within abuul two nmonths after its issuance, will be part divisions desired to the U S Nuclear Regulatory Conintlision.

Washingtonr.

0 f ticultaly useful in evaluatrng the need for art early revision 205. Attention ODrector.

Office of Standards Development concepts and techniqu,.-s.

Because w!de applicability is intended.

ANSI N545. 1975 as well as the provi-sions and clarifications given below in the regulatory position are confined to simple statistical concepts and prescribe no specific statistical techniques.

In fact. the implem-.-ntation of some specifications by rigorous statistical methods may prove difficult for some users of the guide. Therefore, good approx-imate statistical methods are acceptable.

No specific criteria for good approximation are prescribed.

However. the user should judge whether the sample site is adequately large for the approxima- tion and w%+-ether the distribution of the measure-m'ents is sutfiiently close to that assumed in the analysis.

Pr(.blems relating to underlying distribu-tions can he 'tvoided by the use of nonparametric methods Some .-f the specifications which are stated in terms of standard deviations can be reformulated in nearly equivalent specifications for tolerance limits for %%hich simple nonparametric methods are available.

Such reformulations are also acceptable.

A. [Iaid: and WV. J. Conover' are useful reference sources for parametric and nonparametric methods.respectively.

If every TLD i; individually calibrated, the popula-tion parameters for certain errors can be computed directly, and statistical inference is not needed for specifications relating to these errors.C. REGULATORY

POSITION The requirements and recommendations for per-formance specifications.

testing procedures.

calibra-tion procedures, field procedures, and reporting procedures that are included in ANSI N545-1975 are generally acceptable to the NRC staff as the basis for using thermoluminescence dosimetry for the measurement of X and gamma: radiation in the en-virons of NRC-licensed facilitir:.-

subject to the fol-lowing additional provisiu.is

J qualificati~ms.

1. Section 3. -IPerforma..,e Specifications." of ANSI N 545-1975 should bt' cupplemented by the fol-lowing statement: "Each pt rformance specification shall be verified at the 95% confidence level." A. [laid. Stati.;tical "lhior'v 'ith Eiginierint

..lpplicatimts.

John k\\ e% & sons. Inc.. 1t52.'\%. J. (d'ono.er.

Iracci .\'operait,'tri .ttijis. John Wiley &sn.qo, Inc.. I19T1.2. Instead of Section 3.1 of ANSI N545-1975, the following should be used: "The performance of the TLD system shall be determined under laboratory conditions and in a known radiation field with an ex-posure equal to that resulting from an exposure rate of 10 p R/hr during the field cycle. Ninety-five per-cent of the measurements shall fall within 10% of the known exposure." 3. Instead of Section 3.3 of ANSI N545-1975, the following should be used: "Ninety-five percent of the final value-:- (after all appropriate corrections to the measurements are applied, including those for errors expect.d under field conditions)

shall differ from the correct value by less than 30% of the correct value." 4. Instead of Section 4.3.1 of ANSI N545-1975.

the folLwing should be used: "Uniformity shall be determined by giving TLDs from the same batch an exposure equal to that resulting from an exposure rate of 10 a R/hr during the field cycle. The response obtained shall have a relative standard deviation (coefficient of variation)

of less than 7.5%." 5. Instead of Section 4.3.2 of ANSI N545-1975, the following should be used: "Reproducibility shall be determined by givinL- one TLD repeated exposures equal to that resulting from an exposure rate of 10 p R/hr during the field cycle. The responses shall have a relative standard deviation (coefficient of variation)

of less than 3.0%."-

D. IMPLEMENTATION

The purpose of this section is to provide inrorma-tion to applicants and licensees regarding the staffs plans for utilizing this regulatory guide.Except in those cases in which the applicant proposes an acceptable alternative method for com-plying with specified portions of the Commission's regulations, the method described herein will be used in the evaluation of operating license applications docketed after July 15, 1977.If an applicant wishes to use this regulatory guide in developing submittals for applications docketed on or before July 15. 1977, the pertinent portions of the application will be evaluated on the basis of this guide.4.13-2


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