Document: NRC Regulatory Guide
Document ID: 377c2606-4b7c-4c7f-997d-37aed1680452
Document Type: regulatory_guide
Title: Performance, Testing, and Procedural Specifications for Thermoluminescence Dosimetry: Environmental Applications + HISTORY - HISTORY 10/2018 – DG-4019 , Proposed Revision 2 11/2014 – Periodic Review of Revision 1 – Revise (Rev. 2)
Source: NRC Regulatory Guide Division 4
Source URL: https://www.nrc.gov/docs/ML1808/ML18087A169.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-4.13
CFR Part: 
CFR Title: 

Content:
ents and Workshop, San Diego, CA, June 23–25, 2015 (ADAMS Accession No. ML15362A644). DG-4019, Appendix A, Page A-1 APPENDIX A SUMMARY OF ANSI N13.37-2014 DATA-ANALYSIS METHODS Appendix A provides a summary of ANSI N13.37-2014 data analysis methods for information only. This summary is not intended to substitute for use of ANSI N13.37-2014. Licensees should review the standard and use it as the basis for the environmental dosimetry program. ANSI/HPS N13.37-2014 provides revised environmental dosimetry performance specifications and data analysis methods based on the premise that the background radiation at each location is constant. 1. Performance Specifications Dosimeter design criteria (with testing performed under laboratory conditions) should be such that uniformity and reproducibility criteria are sufficient to meet a coefficient of variation (CV) of less than or equal to 7.5 percent for individual groups of 10 dosimeters and an average CV over several dosimeter test groups of less than or equal to 5 percent. 2. Data Analysis Data-analysis methods should be able to detect a facility-related dose (FRD) (e.g., approximately 5 to 6 millirem (mrem) (0.05 to 0.06 millisievert (mSv)) per quarter or approximately 10 to 12 mrem (0.10 to 0.12 mSv) per year). If the calculated minimum differential dose (MDD) is less than 5 mrem (0.05 mSv) per quarter or 10 mrem (0.10 mSv) per year, the MDD should be set at 5 mrem (0.05 mSv) per quarter and 10 mrem (0.10 mSv) per year to avoid false positives at such low doses. The following summarizes the data-analysis method: a. Determine the dosimetry system’s MDD. 1. For each monitored location, determine the historical baseline background dose rate and standard deviation (normalized to a standard monitoring period (e.g., 91 days)). Note that, if the baseline background dose rates are determined after facility operations have begun, a professional health physics staff’s evaluation and judgment will be needed to determine the