放射性核素γ谱分析方法探讨  

γ spectrometry analytical method of radionuclide

作　　者：卿云花 刘盼[1] 郑琪珊 张燕[1] 黄丽华[1] QING Yunhua LIU Pan ZHENG Qishan ZHANG Yan HUANG Lihua(Fujian Center for Prevention and Control of Occupational Diseases and Chemical Poisoning, Fuzhou 350000, Chin)

机构地区：[1]福建省职业病与化学中毒预防控制中心,福州350000

出　　处：《核技术》2017年第9期53-58,共6页Nuclear Techniques

摘　　要：在实验室仅存在混合刻度源条件下,探讨不同解谱方法对放射性核素活度估算的适用性。本文利用HPGe γ谱仪测量样品,并分别采用效率曲线法和相对比较法来分析样品中^(241)Am、^(60)Co、^(137)Cs、^(40)K核素活度。结果表明,若干扰核素对样品中待分析核素产生的影响可忽略,但对混合刻度源中相应的待分析核素影响较大时,经综合考虑,相对比较法所得结果优于效率曲线法;若干扰核素对样品中待分析核素产生的影响不可忽略,但对混合刻度源中相应的待分析核素影响不大时,与相对比较法相比,效率曲线法占优势。Background： Currently, mixture calibration sources, generally used in laboratory for saving cost, are limited in spectrum analysis. Purpose： The aim is to study the suitability of two spectrum analysis methods under the condition of mixture calibration source. Methods： In this work, four radionuclides, ^（241） Am, ^（60） Co, ^（137） Cs, and ^（40） K, were measured by HPGe γ spectrometry and analyzed with relative comparison and efficiency curve methods under the condition of the mixture calibration source. Results： Relative comparison method can not calculate the radioactive activity of test nuclide influenced by interference nuclide, if interference nuclide could be ignored in mixture calibration source. Conclusion： Relative comparison method has an advantage comparing with efficiency curve method, if interference nuclide has no effect on test nuclide included in sample, but has a great effect on test nuclide included in mixture calibration source. However, efficiency curve method has an advantage comparing with relative comparison method. If interference nuclide has a great effect on test nuclide included in sample, but no effect appears on test nuclide included in mixture calibration source.

关 键 词：HPGE Γ谱仪 混合刻度源 分析方法 放射性核素 

分 类 号：TL12[核科学技术—核能科学]