CMGA:一个利用钚的94—104keV γ和X射线非破坏分析其同位素丰度的软件

CMGA: a code to assay abundances of plutonium isotopes non-destructively with γ and X-rays in 94—104 keV energy range

钚样品γ能谱94—104keV能区中有22条X及γ射线可用来提供其同位素丰度信息。本文介绍我们开发的用来解析该能区的CMGA1.0(ChinaMultipleGroupAnalysis,Version1.0)软件。利用该软件分析当前我们所能取得的唯一的具有质谱分析结果的样品。其240Pu/(239Pu+240Pu)多次测量的平均值与质谱法给出的对应数值之比为1.004,相对标准偏差为1.4%。

A multi-channel spectrum of plutonium samples measured by HPGe detector includes 22 γ or X-ray lines in the 94--104 keV energy range, which can be used to provide information on the abundances of plutonium isotopes. A code named as CMGA （China Multi-Group Analyzer, Version 1.0）, developed to unfold this region, is introduced in this paper. One and only one plutonium sample we can obtain was measured 19 times and the results of ^240pu/（^239pu＋^240pu） given by CMGA are presented. The ratio of the mean ^240pu/（^239pu＋^240pu） value from repeated measurements given by CMGA to that given by mass spectrum analysis is 1.004 with a relative standard deviation around ±1.4%.