摘要
本文叙述了带有长度补偿、三种不同直径的内充气式正比计数器的测氚活度过程;系统地研究了各种物理效应,特别是壁效应和吸附效应,给出了后两种效应同计数管半径的实验拟合方程;全面地讨论了误差源并给出各项误差分量的实验测量值。装置稳定度好于0.1％,总不确定度约0.7％(3σ)。同时给出了同标准氚水相一致(0.15％)的比对结果。
In this paper the process of measuring tritium radioactivity using three groups of length compensated internal gas proportianal counters with three different diameters is described. Several physical effects, especially wall effect and absorption effect, are studied systematically and the experimental fitted equation for both later related to counters radius are given. The sources of error are discussed and their experimental values are presented. The precision of this apparatus is better than 0.1% (3σ) and the total uncertainty is better than 0.69% (statistical confidence level 99.7%). The results obtained from measuring standard tritium water are coincidental with the standard value within 0.15%.
出处
《计量学报》
CSCD
1989年第2期144-150,共7页
Acta Metrologica Sinica
