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THE MAYAK WORKER DOSIMETRY SYSTEM-2013 (MWDS-2013): PHASE II-QUALITY ASSURANCE OF ORGAN DOSE CALCULATIONS
V V Vostrotin1, A Birchall2, A V Zhdanov1
1Southern Urals Biophysics Institute, Ozyorskoe Shosse 19, Ozyorsk, Chelyabinsk Region, Russia.
Radiation Protection Dosimetry
|October 7, 2017
Summary
Software tools PANDORA and IMBA show satisfactory agreement in estimating plutonium internal doses. This validation is crucial for accurate internal dose assessment in radiation protection, using fewer simulations when only urine data is available.
Area of Science:
- Radiological Sciences
- Computational Dosimetry
- Nuclear Medicine
Background:
- Accurate estimation of internal radiation doses is critical for health risk assessment and radiation protection.
- Software tools like PANDORA and IMBA are used for calculating doses from internally deposited radionuclides, such as plutonium.
- Validation of these software tools against real-world data and inter-comparison is essential for ensuring reliability.
Purpose of the Study:
- To compare the statistical dose estimates for annual absorbed plutonium internal doses calculated by PANDORA and IMBA software.
- To validate the performance of these software tools using identical datasets from five distinct case studies.
- To determine the adequacy of computational resources, specifically the number of hyper-realizations, for dose calculation.
Main Methods:
- Comparative analysis of dose calculations from PANDORA and IMBA software using five cases with varied plutonium intake data.
- Inclusion of data from lifetime urine activity measurements and post-mortem tissue burden measurements (lungs, lymph nodes, liver, skeleton).
- Comparison of statistical characteristics: geometric mean and geometric standard deviation for lung and bone surface doses.
Main Results:
- Satisfactory agreement was demonstrated between PANDORA and IMBA in estimating statistical characteristics of annual plutonium doses to critical organs.
- The number of required hyper-realizations for calculating the Main Whole-Body Dose Standard (MWDS-2013) was determined.
- Fewer hyper-realizations (100) are sufficient when using only daily urine plutonium activity measurements, compared to using both urine and autopsy data (2000).
Conclusions:
- The PANDORA and IMBA software tools provide comparable and reliable estimates for plutonium internal doses.
- The study confirms the validity of using these tools for assessing internal plutonium exposure.
- Computational efficiency can be improved by adjusting the number of hyper-realizations based on the available measurement data types.
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