Abstract One of the problems of measuring high radioactivity in an emergency scenario is the fact that the detector can become saturated or reach a measuring dead time too high to give reliable results, which means repeating the measurement in different conditions with the associated delay in obtaining the results and the laboratory workers' risk of exposure. The counting rate can be controlled by varying the sample-to-detector distance as well as by using different source volumes. A Monte Carlo model of a BEGe detector was developed to analyse the system efficiency response for several measuring configurations (distances and volumes) using the MCNP6 code. The total efficiency curves were obtained for an energy range between 59.5 keV and 1836 keV. The simulations provided an estimation of the admissible γ-rate for different source volumes (in water matrix) and sample-to-detector distances to avoid detector saturation in given measurement conditions. The results were a compromise between geometry, distance and measuring time for certain emergency situations. Three case studies are provided to show the approach's effectiveness.

中文翻译：

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BEGe 探测器的蒙特卡罗模型，以支持应急响应中的 γ 光谱法

摘要 在紧急情况下测量高放射性的问题之一是检测器可能变得饱和或达到的测量死区时间太长而无法给出可靠的结果，这意味着在不同条件下重复测量，获得相关延迟。结果和实验室工作人员的暴露风险。可以通过改变样品到检测器的距离以及使用不同的源体积来控制计数率。BEGe 探测器的蒙特卡罗模型被开发用于使用 MCNP6 代码分析几种测量配置（距离和体积）的系统效率响应。总效率曲线是在 59.5 keV 和 1836 keV 之间的能量范围内获得的。模拟提供了对不同源体积（在水基质中）和样品到探测器距离的可接受 γ 速率的估计，以避免在给定测量条件下探测器饱和。结果是在某些紧急情况下几何、距离和测量时间之间的折衷。提供了三个案例研究来展示该方法的有效性。