基于能谱重建技术的全身计数器γ能谱分析

γ Spectrum Analysis Based on Reconstruction Technology for Whole Body Counter

为提高全身计数器γ能谱分析精度,开展了基于能谱重建技术的γ能谱分析方法研究。首先建立方法的原理框架;然后进行应用实验,使用一台立式NaI型全身计数器测量含放射性的BOMAB人体模型,并通过建模和蒙特卡罗模拟计算测量矩阵;最后使用boosted-Gold算法求解出射能谱,并将结果与Genie 2000软件进行比较。结果显示,boosted-Gold算法在参数p取1~10时能准确重建出理论的核素出射能谱,实现对所有核素的准确识别,且每种核素的活度计算误差均小于10%,这一结果显著优于Genie 2000软件。

In order to improve the accuracy ofγspectrum analysis for whole body counter measurement,theγspectrum analysis method based on reconstruction technology was studied.Firstly,the principle frame of the method was established,and then an application experiment was carried out by measuring the BOMAB radioactive-phantom with a NaI stand type whole body counter,and the measurement matrix was calculated by modeling and Monte Carlo simulation.Finally,the nuclide emission spectrum was solved by boosted-Gold algorithm,and the results were compared with those by Genie 2000 software.The results show that the boosted-Gold algorithm can reconstruct the theoretical nuclide emission spectrum accurately when the parameter p is within the range of 1-10,and realize the accurate identification of all nuclides with the activity calculation error of each nuclide less than 10%.This result is significantly better than that of Genie 2000 software.