Abstract This article describes an attempt to estimate the background (BG) pulse height spectrum (PHS) of the CeBr3 scintillation spectrometer due to terrestrial gamma ray components. In radiological emergencies, there are some cases which the prior measurement of the background components can't be made. By subtracting the BG components from the measured gross PHS, timely and accurate information about the artificial radionuclides involved in the emergencies would be effectively drawn to protect the member of the public and first responders. A Monte Carlo calculation was conducted to simulate the PHS by gamma rays from natural radionuclides uniformly distributed in the ground. The calculated PHS were verified to be consistent with measured PHS. Derived dose equivalent rate from the calculated PHS were compared with reference value and found to be in good agreement with each other. The study revealed that applying the calculated PHS to the in-situ gamma ray spectrometry components hardly affected the determination of surface deposition density on soil for radioactive cesium.

中文翻译：

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尝试估计由地面伽马射线成分引起的CeBr3闪烁光谱仪的背景脉冲高度谱：在环境辐射监测中的应用

摘要 本文描述了一种估计由地面伽马射线分量引起的 CeBr3 闪烁光谱仪的背景 (BG) 脉冲高度谱 (PHS) 的尝试。在放射紧急情况下，有些情况下无法对本底成分进行事先测量。通过从测量的总 PHS 中减去 BG 成分，将有效地获取有关紧急情况中涉及的人工放射性核素的及时准确信息，以保护公众成员和急救人员。进行蒙特卡罗计算以模拟来自均匀分布在地下的天然放射性核素的伽马射线的 PHS。验证计算出的 PHS 与测量的 PHS 一致。将计算出的 PHS 推导出的剂量当量率与参考值进行比较，发现彼此之间具有良好的一致性。研究表明，将计算出的 PHS 应用于原位伽马射线能谱组件几乎不会影响放射性铯在土壤表面沉积密度的测定。