摘要
利用环境中散落的放射性核素示踪研究土壤侵蚀是近几十年来应用比较广泛的方法之一。介绍了137Cs测量的原理、过程和仪器对核素计数效率的计算,影响核素测量分析精度的主要因素是样品质量、计数时间和样品的核素比活度的大小,并分析了这3个因素各自对分析精度的影响程度,对尽量减少测量中的人为误差、提高结果的精度所应注意的问题进行了讨论。
The tracing method of radioactive nuclide in soil environment is widely applicated in studying soil corrasion. This paper introduces ^(137)Cs determining principium, process and calculation in counting efficiency of nuclide. The major facors in affecting determination and analysis precision are sample quality, counting time and specific activity of nuclide sample. Influence degree of each fator to analysis precision is analyzed and relational problems such as reducing artificial error and advancing analysis precision are discussed in the paper.
出处
《干旱环境监测》
2004年第1期1-4,共4页
Arid Environmental Monitoring
基金
中科院知识创新项目(KZCX1-06)
国家自然基金项目(40071059)资助。
关键词
核素示踪法
分析精度
影响因素
样品质量
计数时间
核素比活度
nuclide tracing method
analysis precision
influence facor
sample quality
counting time
specific activity of nuclide
