基于NaI(Tl)谱仪的3种γ能谱解谱方法比较  

Comparative Study of Three γ Spectrum Solution Methods Based on NaI(Tl) Spectrometer

作　　者：胡有华 王建超 

机构地区：[1]新疆维吾尔自治区辐射环境监督站,新疆 乌鲁木齐

出　　处：《环境保护前沿》2022年第5期1049-1055,共7页Advances in Environmental Protection

摘　　要：目的:NaI(Tl)谱仪相对分辨率较低,通过比较3种解谱方法并选出最优解谱方法,提高γ能谱测量值的准确性和可靠性。方法:先用相对比较、逆矩阵、最小二乘法3种分析方法对已知活度的混合标准源进行活度计算,再比较计算活度与标准源活度的相对偏差。结果:使用相对比较法、逆矩阵法、最小二乘法计算出3种核素相对偏差分别为:226Ra (13.62%、14.71%、9.12%)、232Th (14.43%、20.59%、13.17%)、40K (2.18%、4.91%、4.84%)。结论:使用最小二乘法对226Ra和232Th 2种核素的计算活度相对偏差最小,优于相对比较法与逆矩阵法;40K核素的活度计算采用相对比较法更合适。Objective: The resolution of NaI(Tl) spectrometer is relatively low. By comparing the three spec-trum solution methods and selecting the best solution method, the accuracy and reliability of the measured values of the γ energy spectrum can be improved. Methods: First use relative compari-son, inverse matrix, and least square analysis methods to calculate the activity of the mixed standard source with known activity, and then compare the relative deviation between the calcu-lated activity and the standard source activity. Results: The relative deviations of the three nuclides calculated using the relative comparison method, the inverse matrix method, and the least square method: 226Ra (13.62%, 14.71%, 9.12%), 232Th (14.43%, 20.59%, 13.17%), 40K (2.18%, 4.91%, 4.84%). Conclusions: Using the least square method to calculate the relative deviation of the activities of 226Ra and 232Th nuclides is the smallest, which is better than the relative comparison method and the inverse matrix method. The activity calculation of 40K nuclides is more suitable for the relative comparison method.

关 键 词：Γ能谱 相对比较 逆矩阵 最小二乘逆矩阵 

分 类 号：X3[环境科学与工程—环境工程]