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:
methods for analyzing environmental data, but it does not provide specific data analysis techniques for either method. The two methods are based on two assumptions: (1) Background radiation levels are the same at any location but may vary from year to year. The background radiation levels are assumed to be the same, regardless of the monitoring location. Therefore, dosimetry measurements can be made at control locations (i.e., at a site remote from a nuclear facility) and compared to the dose rate at indicator locations near the monitored facility. (2) Background radiation levels are constant at each location but may vary between locations. The background dose rate at each location is constant (i.e., from preoperational time periods to operational time periods). Dosimetry measurements can be made at a monitoring location and compared to previous (e.g., preoperational) measurements at the same location. Revision 1 to RG 4.13 established the regulatory position that ANSI N545-1975 is a generally acceptable method of performing direct radiation surveys in the environment of NRC-licensed facilities, subject to additional dosimeter performance specifications listed in Revision 1. ANSI N545-1975, Appendix C, “Interpretation of Field Exposures to Isolate Contributions Attributable to Man-Made Radiation Sources (Such as Nuclear Power Plant),” provides a conceptual description of two data-analysis methods, but it does not provide a data-analysis procedure. Operating experience showed that the dosimetry performance specifications in Revision 1 were difficult to meet and unnecessarily burdensome. DG-4019, Page 6 In 1980, the NRC provided guidance on an acceptable method of complying with the EPA 40 CFR 190 requirements. The agency described the method in NUREG-0543, “Methods for Demonstrating LWR Compliance with the EPA Uranium Fuel Cycle Standard (40 CFR Part 190),” issued February 1980 (Ref. 15). NUREG-0543 states conditions under which conformance with 10 CFR Part