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| Decision threshold and detection limit in low-levels of radioactivity measurements |
| WANG Chuangao1, LUO Zhiping1, PANG Hongchao1, YIN Yunyun1, ZHENG Guowen1, XU Yongjun1, LOU Hailin1, WANG Zhongwen1, LI Ruirui1,2 |
1. China Institute of Atomic Energy, Beijing 102413 China;
2. Washington University School of Medicine |
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Abstract Objective The calculation methods for decision threshold and detection limit of radioactivity measurement for low background were discussed.Methods Based on the data from 18 biological samples measured by Alpha spectrometer, formulas of decision threshold and detection limit given in RSG1.2(IAEA), NUREG 1576(USA)and AQ48(IAEA) were used and discussed.Results Parts of the results decided by these three kinds of formulas would be entirely different,which indicated that formulas of NUREG 1576 and AQ48 were much more conservative than the formulas of RSG1.2 for low background counts(as<100).Conclusion To ensure the reliability when judging the measured data, formulas of decision threshold and detection limit must be chosen according to the actual condition (such as background counts, background count time and gross count time, etc.), especially in low-level radioactivity measurements.
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Received: 16 July 2018
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