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Dose Comparisons for a Site-specific Representative Person Using the Age-dependent Dose Coefficients in CAP88-PC
Brooke H Stagich1, Kelsey R Moore, Joseph R Newton
1*Augusta University, Department of Chemistry and Physics, 1120 15th Street, Augusta, GA; †Savannah River National Laboratory, Savannah River Nuclear Solutions, Savannah River Site, Aiken, SC.
Health Physics
|February 25, 2017
Summary
The U.S. Environmental Protection Agency
Area of Science:
- Environmental Science and Engineering
- Radiation Protection
- Dosimetry
Background:
- U.S. Department of Energy (DOE) facilities use the Environmental Protection Agency's (EPA) CAP88-PC code for radiological airborne release compliance.
- EPA's CAP88-PC Version 4 (2015) introduced age-dependent dose factors but lacked specific guidance.
- The Savannah River Site (SRS) transitioned from the Maximally Exposed Individual (MEI) to the representative person concept for dose compliance.
Purpose of the Study:
- To compare radiation dose estimates between the MEI and SRS-specific representative person using CAP88-PC V.4.
- To evaluate the impact of age-dependent factors on dose assessments for compliance with DOE public dose regulations.
- To analyze dose differences across six age groups for key radionuclides at SRS.
Main Methods:
- Utilized CAP88-PC Version 4 with age-specific dose coefficients and usage factors.
- Conducted dose comparisons between the traditional MEI (adult male) and a SRS-specific representative person.
- Calculated doses for six age groups (infant to adult) considering five specific radionuclides (tritium oxide, Cs, Sr, Pu, I).
Main Results:
- The representative person concept resulted in an approximate 11% increase in total effective dose compared to the NESHAP MEI.
- This increase is attributed to the inclusion of more radiosensitive age groups in the representative person calculation.
- Dose variations were observed across different age groups and radionuclides.
Conclusions:
- The representative person concept, incorporating age-dependent factors, provides a more comprehensive dose assessment for regulatory compliance.
- Implementing CAP88-PC V.4's age-specific data is crucial for accurate public dose evaluations at DOE facilities.
- The findings support the shift towards a representative person approach for demonstrating compliance with radiological air emission standards.
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