摘要
采用电沉积法制备了一枚228Th面源。通过α能谱分析,观察了^(228)Th面源中^(224)Ra与^(228)Th达到放射性平衡的过程,确定该源的电沉积回收率为54%。将该^(228)Th面源置于钍射气室内,测量钍射气的体积活度,以确定其钍射气析出率。结果显示,228Th面源钍射气析出率具有良好的稳定性、复现性,且受温湿度影响较小。
A ^(228)Th plate source was prepared using electrodeposition method.Through the analysis of the alpha energy spectrum,the radioactive equilibrium process between ^(224)Ra and ^(228)Th in the ^(228)Th plate source was observed,and the recovery rate of the electrodeposition was determined to be 54%.The volume activity of ^(220)Rn in thoron chamber where the ^(228)Th plate source placed was measured to determine the ^(220)Rn exhalation rate of the source.The results showed that the ^(220)Rn exhalation rate of this source had promising stability and reproducibility,as well as outstanding resistance to temperature and humidity.
作者
赵超
何林锋
韩刚
刘佳煜
陈彦良
Zhao Chao;He Linfeng;Han Gang;Liu Jiayu;Chen Yanliang(Shanghai Institute of Measurement and Testing Technology)
出处
《上海计量测试》
2021年第1期10-13,共4页
Shanghai Measurement and Testing
基金
上海市科委科研计划项目(19DZ2292600、19QB1404900)
上海市市场监督管理局科技计划项目(2018-07)。
