微量α测量的屏栅电离室谱仪的研制

Development of a Grid Ionization Chamber for a Dram ofαRay

为了测量微量α放射性活度,研究了平行板α屏栅电离室谱仪系统。设计了一套带独立真空系统的屏栅电离室。该谱仪系统将电离室主体、充气系统及电子学系统三部分集成为一体,可缩小体积,节省放置空间,使操作智能化。电离室测试结果显示,239 Pu源能量分辨率可达26keV,在4~6 MeV能区本底计数率为10h^(-1),24h系统漂移不大于0.5%。结果表明,该谱仪系统可用于测量核素的α射线能量,分析能谱结构,鉴定核素。

This article introduced the parallel grid ionization chamber that used to meas-ure the a radioactivity, which had a independent vacuum system. The system was com-posed of main body of the chamber, gas-filled and electronics system. Energy resolution was 26 keV for 239 Pu, background was 10 counts for one hour from 4 MeV to 6 MeV en-ergy range, the stability of 24 hours was less than 0. 5 % . The chamber can measure the energy of nuclide and analyze the energy spectrum structure to identify nuclear.