【摘要】 应用费米理论计算了６０多种核素的β谱形、计数效率。为了发现效率外推中存在的Ｂ类不确定度，计算了斜率（１－Ｋ）和归一化效率函数。这里给出了￣（１４７）Ｎｄ和￣（１３４）Ｃｓ的计算和实验结果。当可达到的最高效率低时，用计算结果改善了外推准确度。更多还原

【Abstract】 The shape and the counting emciency of βpariicle spotra having different end-energy have ben calculatedwith Fermi theory for more than sixty nuclides. An attempt was made to calculate the slope(1-K)and normali-zation efficiency function in order to find the possible type B uncertainty intreduced by extrapolation. The ob-tained results of normalization efficiency function for nuclides ￣(147)Nd and ￣(134)Cs are presented.The type B un-certainty due to extrapolation was reduced whenβobserved efficiencies were low.(更多还原