摘要
简述了液体闪烁计数的单管及双管符合外推方法绝对测量３Ｈ、１４Ｃ活度的基本原理。零几率校正采用相对探测阈外推法，并提出了迭代零几率外推方法。不同方法的测量结果与参考值相比，偏差在０．４％—２．０％以内。
The basic principles of liquid scintillation counting of single photomultiplier extrapolation method and double photomultipliers coincidence method for absolute measurements of specific activity of 3H and 14 C,are described briefly.The method of relative detection threshold extrapolation was used in correction of non detection probability.The new method of non detection probability extrapolation is put forward. The deviations measured from the reference values of specific activities are in the range of 2% to 0 4% for 3H and 14 C,respectively.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
1997年第6期503-507,共5页
Atomic Energy Science and Technology
关键词
液体闪烁计数
绝对测量
比活度
氢3
碳14
Liquid scintillation counting Absolute measurement 3H 14 C Specific activity
