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:
” describes, in detail, proper methods for determining extraneous dose. 2. Calculate the average field dosimeter reading at each monitored location (assuming that two or more dosimeters were used at each location). 3. Normalize the average field dosimeter readings at each location to a standard monitoring period (e.g., 91-day quarterly period). 4. Calculate the standard deviation and the CV at each field location. This information will be used later to identify outliers for investigation. c. Determine the extraneous dose. Note that this analysis assumes that control dosimeters were stored in a lead storage vault during the deployment period. In addition, note that the concept of “control dosimeters” is different that the concept of “control locations.” 1. The extraneous dose is the dose accrued in the time before deployment and after deployment. Extraneous dose is NOT simply the dose on control dosimeters stored in a lead vault/pig. Control dosimeters stored in a lead vault contain both extraneous dose and storage dose (i.e., the dose accrued while in the lead storage vault). Storage dose is not part of the extraneous dose and, therefore, must be subtracted from the dose on the control dosimeter to determine the extraneous dose. 2. Calculate the amount of extraneous dose by subtracting the storage dose from the gross dose on the control dosimeters. Note that the typical storage dose in a lead storage vault is approximately 7 mrem (0.07 mSv) per quarter from high-energy cosmic radiation. d. Determine the net field doses. 1. Calculate the gross (uncorrected) field dosimeter average dose, standard deviation, and CV. Investigate the cause of any CV greater than 10 percent. Remove any dosimeter reading from the data set that has a justifiable reason for being an outlier. The following are justifications for the removal of outlier dosimeter data: a. abnormal high or low readings on some chips as compared to those on other chips (high standard deviation among