摘要
低水平放射性测量的重要条件,要求探测器的本底较小。在实验室里,本底来源可分为三个方面:探测器及其邻近屏蔽材料的污染;实验室周围环境的射线;宇宙射线。本底要最小,就必须尽力降低这三方面的影响。本工作除在前二者作了努力外,特别在压低宇宙射线本底方面作了细致观察和处理。结果,使得该谱仪的本底成为当前同类谱仪中最低的一个,达到8.7±0.1个/min(100-2000 keV能区)。
In the measurements of low level radioation the background of a detector ordetection system should be as low as possible. In laboratory the backgroundusually comes from three sources: radioactive impurities in the detector andshielding material, environment radioation from the laboratory and the cosmicrays. In this work, the measures is taken to reduce the background causedby the first two effects. Special effort is made to overcome the backgroundfrom the cosmic rays. As a result for our spectrometer a background rate as lowas 8.7±0.1 count/min over the energy range from 100 to 2000 keV is obtained,which is presently one of the lowest among the spectrometers of its kind.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
1989年第3期15-20,共6页
Atomic Energy Science and Technology
关键词
反符合屏蔽
谱仪
宇宙线
辐射
HPGe detector
Anticoincidence shield
Gamma-ray spectrometer
Cosmic-rays
Low background
