就地γ谱仪峰谷比法测量^(137)Cs深度分布  

Peak-to-Valley Ratio Method to Determine Depth Distribution of ^(137)Cs in Soil by In-Situ γ Spectrometry

作　　者：冯天成[1] 贾明雁[1] 冯元举[1] 苏川英[1] 吴睿[1] 陈伟[1] 龙斌[1] 程建平[2] 

机构地区：[1]西北核技术研究所,陕西西安710024 [2]清华大学工程物理系,北京100084

出　　处：《原子能科学技术》2011年第6期722-729,共8页Atomic Energy Science and Technology

摘　　要：研究就地γ谱仪测量地表层137Cs深度分布的峰谷比法,建立了就地γ能谱峰谷比数值计算公式和实验剥谱方法。理论计算表明,峰谷比随137Cs张弛深度的变化十分灵敏,土壤密度误差对峰谷比有一定影响,但变化不大时,对峰谷比法结果影响可忽略。野外验证实验显示,峰谷比法相对于样品实验室分析结果的最大相对偏差为31%,表明峰谷比法是可行的,所建立数值计算公式、实验剥谱方法是正确的。The peak-to-valley ratio（PVR） method was approached to determine the depth distribution of ^137Cs in soil by in-situ γ spectrometry.Theoretical calculations show that the variation of PVR is much sensitive with the dissimilarity of radioactive depth distribution,and the influence of soil density uncertainty to PVR is slight and can be neglected when the variation of soil density is within 10%.Field experiments were performed to justify the theories as correctness.The results show that the maximum relative deviation of in-situ γ spectrometry is about 31% relative to the samples analysis in laboratory,which indicates that PVR method of in-situ γ spectrometry is correct for the determination of radioactive depth distribution in soil.

关 键 词：就地Γ谱仪 137Cs 深度分布 峰谷比法 

分 类 号：TL81[核科学技术—核技术及应用]