Abstract
In this study, the theory of minimum detectable activity concentration (MDAC) for airborne gamma-ray spectrometry (AGS) was derived, and the relationship between the MDAC and the intrinsic efficiency of a scintillation counter, volume, and energy resolution of scintillation crystals, and flight altitude of an aircraft was investigated. To verify this theory, experimental devices based on NaI and CeBr3 scintillation counters were prepared, and the potassium, uranium, and thorium contents in calibration pads obtained via the stripping ratio method and theory were compared. The MDACs of AGS under different conditions were calculated and analyzed using the proposed theory and the Monte Carlo method. The relative errors found via a comparison of the experimental and theoretical results were less than 4%. The theory of MDAC can guide the work of AGS in probing areas with low radioactivity.
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All authors contributed to the study’s conception and design. Material preparation, data collection, and analysis were performed by Yi Gu, Kun Sun, Liang-Quan Ge, Yuan-Dong Li, Qing-Xian Zhang, Xuan Guan, Wan-Chang Lai, Zhong-Xiang Lin, and Xiao-Zhong Han. The first draft of the manuscript was written by Yi Gu and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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This work was supported by the Sichuan Science and Technology Program (No. 2020JDRC0108) and the National Science Foundation of China (Nos. 41774147 and 41774190).
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Gu, Y., Sun, K., Ge, LQ. et al. Investigating the minimum detectable activity concentration and contributing factors in airborne gamma-ray spectrometry. NUCL SCI TECH 32, 110 (2021). https://doi.org/10.1007/s41365-021-00951-6
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DOI: https://doi.org/10.1007/s41365-021-00951-6