4πβ－γ符合测量中参数法的改进

An Improvement on Accuracy of Parameter Method in 4πβ-γ Coincidence Counting

用费米理论对５０多种核素不同端点能量分支的β谱形、平均能量和计数效率进行了计算。在３０～４１４０ｋｅｖ能量范围用了约２００个数据点得到了精密的β射线平均能量和最大能量的关系。使用计算的数据，对于具有低能和高能β射线和低能内转换电子的核素，在计数率较低的情况下，用Ｃａｍｐｉｏｎ参数法得到的衰变率的总不确定度有了较大的改善。

The shape,the mean energy and the counting efficiency of beta particle spectra having dif-ferent maximum energies have been calculated by Fermi theory for more than fifty nuclides.Relation between maximum and mean energy of beta rays has been gotten precisely in the en-ergy,range of 30～4140 keV using about 200 data. The accuracy of the disintegration rate ob-tained by Campion with parameter emthod in activity standardization has been improved fornuclides having lower and/or higher beta rays energy and of lower energy conversion elec-trons.(