摘要
本工作用多线法和距离变换法相结合,精确地刻度了γ射线源置于Ge(Li)探测器表面时的γ全能峰效率曲线和全效率曲线,这样使谱仪能有效地测量包括存在级联γ跃迁的低活度γ射线的强度。结果达到了γ能量在120—1115keV能区内,相对峰效率误差小于1.5％,绝对峰效率误差小于1.6％,全效率误差小于4.1％。这种方法的优点是用未识活度的γ参考源刻度出较高精度的放射源-探测器近距离几何的相对峰效率。
A method for the efficiency calibration of a Ge (Li) detector at short source-to-detector distance is described. It combines the multi-gamma-ray source calibration method with the distance variation method with several single-gamma-ray sources. The full-energy peak relative efficiency, full-energy peak absolute efficiency and total efficiency have been determined with an error of 1.5%, 1.6% and 4.1% respectively at the energy ranging from 120 to 1115 keV. Therefore the spectroscopy can be used effectively to measure weak gamma-ray source which may emit cascading photons. With the method, the full-energy peak relative efficiency can be calibrated using an unknown activity ga-mma-ray source.
出处
《核技术》
CAS
CSCD
北大核心
1989年第2期105-109,共5页
Nuclear Techniques
关键词
Ge(Li)
效率刻度
探测器
放射源
Ge(Li) Efficiency calibration Short source -to-detector geometry
