同位素2026，Vol.39Issue(3)：259-265,7.DOI:10.7538/tws.2026.youxian.011
块坐标下降法在钚丰度伽玛能谱分析中的应用
The Application of Block Coordinate Descent Method in Pu Isotopic Composition Analysis by Gamma Spectrum
李羽峰 1于春兰 2茆亚南 1赵浩程 1许小明1
作者信息
- 1. 中国原子能科学研究院,北京 102413
- 2. 中核四0四有限公司,兰州 732850
- 折叠
摘要
Abstract
To expand the coverage of data points used for fitting the relative efficiency curve in plutonium Isotopic Composition analysis via gamma spectrometry,and to enhance the accuracy of the relative efficiency curve fitting,the block coordinate descent method is employed to normalize the relative detection efficiencies at different energy points of distinct nuclides.Outlier data points are removed based on the 3σ criterion,and the remaining points are used to fit the relative detection efficiency curve.The energy spectra of plutonium samples with three different abundances were analyzed using the approximation method,the interpolation method,the block coordinate descent method,and the two energy regions defined in FRAM.The results show that the maximum deviation of the 239Pu content obtained by the block coordinate descent method from the nominal value is 3.4%,which is a significant improvement compared to the approximation method and the interpolation method.The root mean square error of the relative detection efficiency curves fitted by the block coordinate descent method under three shielding conditions is calculated.The result with 2 mm cadmium shielding is the best and 2 mm cadmium is suitable for the analysis of sample abundance.关键词
块坐标下降法/相对效率法/钚丰度Key words
block coordinate descent method/relative efficiency method/plutonium abundance分类
能源科技引用本文复制引用
李羽峰,于春兰,茆亚南,赵浩程,许小明..块坐标下降法在钚丰度伽玛能谱分析中的应用[J].同位素,2026,39(3):259-265,7.
