一、前言采用4πβ-γ符合吸收法测量燃耗监测体~(144)Ce的活度,此种方法准确度较高,且不需要知道衰变纲图的核参数,但是对于大量测量来说,显得太烦琐费时。同时,为提供一种可作比较的方法,对参数法也做了一些工作,并与符合吸收法进行比较,二者在1%左右符合。 I. INTRODUCTION The activity of ~ (144) Ce is measured by 4πβ-γ in accordance with the absorption method. This method is more accurate and does not require knowledge of the nuclear parameters of the decay scheme. However, for a large number of measurements, It is too cumbersome and time-consuming. At the same time, to provide a comparable method, some work has also been done on the parametric method, which is in line with the absorption method, both of which comply with about 1%.