4πβ(pc)-γ(HPGe)符合法测量^(166m)Ho活度  

Determination of ^(166m) Ho activity by 4πβ(pc)-γ(HPGe) coincidence measurement

作　　者：连琦[1] 常永福[1] 等 

机构地区：[1]西北核技术研究所，陕西西安69信箱14分箱710024

出　　处：《核电子学与探测技术》2002年第1期41-43,51,共4页Nuclear Electronics & Detection Technology

摘　　要：用 4 πβ(pc) - γ(HPGe)符合法测量了 166m Ho比活度。实验选择与两 β分支分别级联的 75 2 ke Vγ射线和 712 ke Vγ射线 ,这两条 γ跃迁终态是同一能级 ,通过测量 γ谱和符合 γ谱得到 β探测器对 166mHo两 β分支的探测效率。根据实验测量的对 166Er7能级以下内转换电子的探测效率 ,用能级效率的方法确定了内转换电子效率等于We have measured the specific activity of 166m Ho by 4πβ(pc) γ(HPGe) coincidence method. The 752 keV and 712keV γ rays associated with the two β branches were chosen, the twoγ transitions de excited to the same level. The detecting efficiency of two β branches were measured by γ spectrum and coincident γ spectrum . The energy threshold when conversion electron efficiency is greater than 1 was measured by the energy level efficiency method by using the experimentally determined conversion electron efficiency with 166Er energy level below the 7th.

关 键 词：4πβ(pc)-γ(HPGe)符合 放射性活度 钬166 测量 Β射线 内转换电子效率 

分 类 号：O614.343[理学—无机化学] O615.13[理学—化学]