【摘要】 建立了一套４πβ（ＰＣ）－γ（ＨＰＧｅ）符合装置。用参数和效率外推两种方法测定了￣（１９２）Ｉｒ绝对活度，最终不确定度分别为０．４％和０．５％（９９．７％置信水平）．提出了一种用４πβ（Ｐｃ）－γ（ＨＰＧｅ）符合装置、效率外推法测定兼有β、ＥＣ两种衰变方式核素的分支比和绝对活度的方法。测得￣（１９２）Ｉｒβ￣－衰变份额为０．９５７２。完全不用核参数测得之绝对活度和β￣－衰变分支比的误差分别为１；５％和１．８％（９９．７％置信水平）。更多还原

【Abstract】 The absolute disintegration rates for nuclide ￣(192)Ir were measured with a 4πβ─γ(HPGe)coincidence apparatus by using parameter method and extrapolation method. The final uncer-tainties obtained were 0.4% and 0.5%respectively for a confidence level of 99.7%. Themethod with which both the disintegration rate and the decay branching retio can be measuredfor nuclides with β￣-,EC mixing decays was proposed and described. The β￣- branching ratioin ￣(192)Ir decays was measured being 0.9572.The final uncertainies of disntegration rates andβ￣- decay branching ratio with this method were 1.5%and 1.8%respectively.(更多还原