^(169)Yb放射性核素溶液的活度测量

ACTIVITY MEASUREMENT OF ^(169)YbRADIONUCLIDE SOLUTlON

文章简要介绍了４πＸ（ＰＰＣ）－γ符合方法测量￣（１６９）Ｙｂ放射性核素溶液的活度，测量结果的相对总不确定度１．８％，（３σ），考虑到￣（１６９）Ｔｍ亚稳态对符合计数的影响，选择了较大的符合分辨时间。

The paper gives a brief description of the measurement of ￣(169)Yb radionuclide rolution' s activi-ty with 4πX(PPC) -γ coincidence. The total uncertainty of the measurement is 1 . 8 % (3σ ) .Con-sidering the effect of a metastable state of￣(169)Yb, which is about 0 . 66μs on coincidence counting,larger coincidence resolution time is selected.