In order to accurately measure the activity concentration of source 134 Cs,the relationship between the γ-ray coincidence correction factor of source 134 Cs and the radius and height of source is studied.For its 796 keV gamma rays,the decay of 134 Cs was decomposed into three processes according to the decay diagram.Monte Carlo simulation was used to simulate the decay processes of 30 kinds of 134 Cs sources with different radius and heights,record the non-coincidence count and coincidence count of each process,and carry out the characteristic peak and coincidence correction analysis of the source 134 Csγspectrum.The results show that the characteristic peak of 134 Cs γ 796 keV is determined by three different decay processes,each of which has a coincidence summing probability.The relationship between the source 134 Cs 796 keV gamma ray coincidence correction factor and the source radius and height is a binary quintic polynomial relationship,the source height has a greater influence on the coincidence correction factor,and the source radius has a relatively small influence on the coincidence correction factor.
关键词
源半径和高度/134/Cs/特征γ能峰/符合修正
Key words
source radius and height/134 Cs/characteristic γ energy peak/coincidence correction
万方数据