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| Counting loss correction in 37Ar activity measurement based on Geant4 simulation |
| KONG Shuying1, YANG Baolu1, WANG Rensheng2, ZHANG Ming3, LU Tianxiang1, TUO Fei1 |
1. National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088 China;
2. School of Radiation Medicine and Protection, Medical College of Soochow University, Suzhou 215123 China;
3. National Institute of Metrology, Beijing 100029 China |
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Abstract Objective To correct the counting loss of 37Ar below the activity threshold during the measurement of the absolute activity of the inert radioactive gas 37Ar using the proportional counter filled with gas. Methods Monte Carlo simulation with Geant4 was performed to establish a proportional counter model and output the energy deposition spectrum of 37Ar, which were used to simulate and analyze the causes and correction of counting loss. Results The photon detection efficiency was only 38.7% at 60 kPa. The counting loss was mainly caused by the wall effect produced by the photons, which could be reduced by increasing the gas pressure and corrected by extrapolation. The influence of wall effect at 100 kPa was 4.4%, and the deviation between simulation and experiment was < 0.6%. Conclusion A factor could be calculated by Geant4 simulation for the correction of counting loss, thus achieving the accurate measurement of 37Ar activity by proportional counter.
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Received: 08 September 2022
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