模拟低层大气中宇宙辐射和有效剂量的机载gamma-ray光谱学
Airborne gamma-ray spectroscopy for modeling cosmic radiation and effective dose in the lower atmosphere
摘要：
本文介绍了在第勒尼安海上空进行的$\sim$ 5小时航空伽玛射线调查的结果，调查的高度范围为（77-3066）m。用AGRS_16L探测器（4个4L NaI（Tl）晶体模块）进行了γ能谱测量。实验装置安装在Radgyro上，这是一架原型飞机，设计用于近距离遥感领域的多传感器采集。通过在海洋上获取高统计谱（即在没有具有地质起源的信号的情况下）和通过跨越宽的高度谱，可以将测量的计数率分成恒定的飞机分量和随高度增加而指数地增加的宇宙分量。通过监测在>3 MeV能量区具有纯宇宙起源的计数率，可以推断出$^{40}$ K、$^{214}$ Bi和$^{208}$ Tl泄漏中的背景计数率，在处理航空伽马射线数据时需要减去这些数据，以估计地下钾、铀和钍的丰度。此外，通过实施CARI-6P和EXPACS剂量学工具进行了校准程序，根据该校准程序，对人类的年宇宙有效剂量与测量的宇宙计数率呈线性关系。
英文摘要：
In this paper we present the results of a $\sim$5 hour airborne gamma-ray survey carried out over the Tyrrhenian sea in which the height range (77-3066) m has been investigated. Gamma-ray spectroscopy measurements have been performed by using the AGRS_16L detector, a module of four 4L NaI(Tl) crystals. The experimental setup was mounted on the Radgyro, a prototype aircraft designed for multisensorial acquisitions in the field of proximal remote sensing. By acquiring high-statistics spectra over the sea (i.e. in the absence of signals having geological origin) and by spanning a wide spectrum of altitudes it has been possible to split the measured count rate into a constant aircraft component and a cosmic component exponentially increasing with increasing height. The monitoring of the count rate having pure cosmic origin in the >3 MeV energy region allowed to infer the background count rates in the $^{40}$K, $^{214}$Bi and $^{208}$Tl photopeaks, which need to be subtracted in processing airborne gamma-ray data in order to estimate the potassium, uranium and thorium abundances in the ground. Moreover, a calibration procedure has been carried out by implementing the CARI-6P and EXPACS dosimetry tools, according to which the annual cosmic effective dose to human population has been linearly related to the measured cosmic count rates.
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