Procedure for characterization and validation of commercial clearance monitors using Monte Carlo simulations
Procedure for characterization and validation of commercial clearance monitors using Monte Carlo simulations
复制标题
使用蒙特卡罗模拟对商业清关监测器进行表征和验证的程序
DOI：
10.1016/j.nima.2022.167465
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Sabine Mayer
中科院分区：
文献类型：
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作者：
F. Geser;D. Werthmüller;M. Kasprzak;E. Yukihara;Sabine Mayer
本工作的目标是提出和验证一个用于校准间隙监测仪的数值模型，目的是确定测量的计数率与非标准放射性核素和几何形状的活度之间的转换因子。为此，使用多用途代码FLUKA进行蒙特卡罗模拟，并结合用于校正模拟结果的模型参数的离线优化。通过对比间隙监测仪空室点源的实验测量结果与仿真结果进行参数优化，并将仿真结果与不同几何形状点源的测量结果进行模型验证。验证中计算的效率与测量的效率之间的最大相对差异< 10%。本程序适用于粒子加速器和核设施中使用的间隙监测器的校准，在这些设施中，需要测量各种放射性核素、材料和几何形状，并将其从监管控制中释放出来。
The goal of the present work is to propose and validate a numerical model for the calibration of clearance monitors, aimed at determining conversion factors between the measured count rates and the activity for non-standard radionuclides and geometries. For this, Monte Carlo simulations were carried out using the multipurpose code FLUKA in combination with an offline optimization of the model parameters used to correct the simulation results. Parameter optimization was performed by comparing experimental measurements of point sources in an empty chamber of a clearance monitor with the simulation results, whereas for model validation, the simulation results were compared to measurements of the sources in different geometries. The maximum relative discrepancy between the calculated and measured efficiencies in the validation was< 10%. This procedure is relevant for the calibration of clearance monitors used in particle accelerator and nuclear facilities, where a variety of radionuclides, materials and geometries need to be measured and released from regulatory control.