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Development of a Grid Ionization Chamber for a Dram of α Ray

YANG Lu;WANG Qiang;ZHENG Yu-lai;WANG Guo-bao   

  1. Department of Nuclear Technology Application, China Institute of Atomic Energy, Beijing 102413, China
  • Online:2016-11-20 Published:2016-11-21

微量α测量的屏栅电离室谱仪的研制

杨璐;王强;郑玉来;王国保   

  1. 中国原子能科学研究院 核技术应用研究所,北京102413

Abstract:

This article introduced the parallel grid ionization chamber that used to measure the α radioactivity, which had a independent vacuum system. The system was composed of main body of the chamber, gas-filled and electronics system. Energy resolution was 26 keV for 239Pu, background was 10 counts for one hour from 4 MeV to 6 MeV energy 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.

Key words: grid ionization chamber, energy resolution, &alpha, low level measurement

摘要:

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,239Pu源能量分辨率可达26 keV,在4~6 MeV能区本底计数率为10 h-1,24 h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。

关键词: 屏栅电离室, 能量分辨率, 低放射性&alpha, 测量