4πβ+4πγ计数相加法绝对测量^(182)Ta溶液的放射性比活度  

Absolute measurement of activity of ^(182)Ta using the 4πβ+4πγ counting meathod

作　　者：张小林[1] 李元景[1] 李琦[2] 凡金龙[2] 刘杰[2] 常永福[2] 

机构地区：[1]清华大学工程物理系,北京100084 [2]西北核技术研究所,西安710024

出　　处：《核电子学与探测技术》2007年第3期516-520,共5页Nuclear Electronics & Detection Technology

摘　　要：182Ta发射低能和高能两组γ射线,半衰期适中,是HPGe探测器效率刻度的合适标准源之一。用4πβ+4πγ计数相加法绝对测量了182Ta溶液的放射性比活度1。82Ta通过反应堆活化得到,4πβ+4πγ计数相加装置对182Ta的总探测效率高达99%以上,182Ta溶液比活度测量的相对合成标准不确定度为0.2%。182Ta emits two groups γ-rays in the low and high energy range.And it has a moderate long half-life,so that it is one of the suitable standard sources to calibrate the efficiency curve of HPGe detectors.The specific activity of 182Ta solutionwas measured using the 4πβ+4πγ counting meathod.Sources of 182Ta were produced by thermal neutron in the reactor.The total efficiency of 4πβ+4πγ counting deviceto 182Ta reaches above 99%,and the relativetly combined standard uncertainty of the specific activity is 0.2%.

关 键 词：182Ta 4πβ+4πγ计数相加法 放射性活度 

分 类 号：O571.3[理学—粒子物理与原子核物理]