辐射防护 ›› 2017, Vol. 37 ›› Issue (2): 116-120.

• 核物理与辐射防护 • 上一篇    下一篇

HPGe γ谱仪测量级联γ辐射152Eu、133Ba、60Co核素活度的方法

杜云武   

  1. 四川省辐射环境管理监测中心站,成都 610031
  • 收稿日期:2016-01-20 出版日期:2017-03-20 发布日期:2021-11-11
  • 作者简介:杜云武(1970—),男,2009年10月毕业于四川大学粒子物理与原子核物理专业,硕士,副研究员。E-mail:353658296@qq.com

Method for measuring the activity of 152Eu, 133Ba and 60Co with γ ray cascade by HPGe spectrometer

Du Yunwu   

  1. Sichuan Provincial Radiation Environment Management and Monitoring Center Station, Chengdu 610031
  • Received:2016-01-20 Online:2017-03-20 Published:2021-11-11

摘要: 给出了HPGe γ谱仪测量级联γ辐射核素活度的一种实用方法,在探测器与样品之间放置一定厚度的水吸收层,能够很好降低探测效率,显著降低级联γ符合效应和偶然符合效应的影响。实验表明,TC-45样品中152Eu、133Ba、60Co核素活度的探测效率和测量活度相对偏差随水吸收层厚度增加遵循指数衰减规律,当厚度增加到70 mm以上,其测量活度相对偏差小于4%。

关键词: 吸收层, 偶然符合, γ级联符合

Abstract: A practical method for measurement of cascade gamma radiation nuclide by HPGe gamma spectrometer is given. A certain thickness water absorption layer is placed between the detector and the sample, which can reduce the detection efficiency and reduce the effect of the cascade gamma coincidence effect. Experiments showed that the detection efficiency and activity relative deviation of 133Ba, 60Co and 152Eu radionuclide in TC-45 samples are followed by exponential decay with the increase of the water absorption layer thickness. When the thickness is increased to 70 mm, the relative deviation of measurement is less than 4%.

Key words: absorbing layer, coincidence, gamma cascade

中图分类号: 

  • R144