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首页> 外文期刊>Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine >Sensitivity and uncertainty analysis of the simulation of 123I and 54Mn gamma and X-ray emissions in a liquid scintillation vial.
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Sensitivity and uncertainty analysis of the simulation of 123I and 54Mn gamma and X-ray emissions in a liquid scintillation vial.

机译：液体闪烁小瓶中123i和54mNγ和X射线排放的敏感性和不确定性分析。

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摘要

Radiation transport simulations of the most probable gamma- and X-ray emissions of (123)I and (54)Mn in a three photomultiplier tube liquid scintillation detector have been carried out. A Geant4 simulation was used to acquire energy deposition spectra and interaction probabilities with the scintillant, as required for absolute activity measurement using the triple to double coincidence ratio (TDCR) method. A sensitivity and uncertainty analysis of the simulation model is presented here. The uncertainty in the Monte Carlo simulation results due to the input parameter uncertainties was found to be more significant than the statistical uncertainty component for a typical number of simulated decay events. The model was most sensitive to changes in the volume of the scintillant. Estimates of the relative uncertainty associated with the simulation outputs due to the combined stochastic and input uncertainties are provided. A Monte Carlo uncertainty analysis of an (123)I TDCR measurement indicated that accounting for the simulation uncertainties increases the uncertainty of efficiency of the logical sum of double coincidence by 5.1%.
机译：已经进行了（123）I和（54）Mn中最可能伽马和X射线排放的辐射运输模拟，已经进行了三个光电倍增管液体闪烁探测器。使用Triple与双重符合比（TDCR）方法的绝对活性测量的绝对活性测量所需的闪烁剂来利用GEANT4模拟来获取能量沉积光谱和相互作用概率。这里给出了仿真模型的灵敏度和不确定性分析。由于输入参数不确定性，蒙特卡罗模拟结果中的不确定性被发现比典型数量的模拟衰减事件的统计不确定性组件更为显着。该模型对闪烁剂体积的变化最敏感。提供了由于组合的随机和输入不确定性而与模拟输出相关的相对不确定性的估计。对（123）I TDCR测量的蒙特卡罗不确定性分析表明，仿真性不确定性的核算增加了双重巧合效率的不确定度为5.1％。

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