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本次报告了用核爆后放射性落下灰γ能谱中~(140)La的1.60 MeVγ射线全能峰,在一定的时间间隔内,两次测得的峰面积比,估算核爆日期的方法。通过不同的时间测得的γ能谱,应用DJS-14型电子计算机,任意取两次测得的γ峰面积组合进行计算,求平均值。用我国几次核试验进行检验,结果表明,~(140)Ba-~(140)La不但是核爆的信号元素,而且作为估算近期(核爆后15天内)核爆的时间,也是可取的,不确定性小于1天。同时,从理论上研究了峰面积测量精确度、核爆到第一次测量的时间间隔、两次峰面积测量的时间间隔对核爆日期估算误差的影响;如果要求核爆日期估算误差小于1天时,峰面积测量所必须达到的精确度。这个方法最大的优点是:NaI(Tl)γ闪烁谱和Ge(Li)γ能谱均适用。
This report reports the method of estimating the nuclear explosion date by measuring the peak area ratio of 1.60 MeV gamma ray all-energy peak of ~ (140) La in the γ-ray spectrum of radioactivity after nuclear explosion and measuring twice at a certain time interval. The gamma spectra measured at different times were calculated using a DJS-14 electronic computer and any combination of gamma peak areas measured twice to find the average. The results of several nuclear tests in our country indicate that ~ (140) Ba- ~ (140) La is not only a signal element of nuclear explosion but also is a good candidate for estimating the time of recent nuclear explosions (within 15 days after nuclear explosion) Uncertainty less than 1 day. In the meantime, the influence of the peak area measurement accuracy, the time interval from the nuclear explosion to the first measurement and the time interval between the two peak area measurements on the estimation error of the nuclear explosion date has been theoretically studied. If the estimation error of the nuclear explosion date is less than 1 The accuracy of the peak area measurements must be achieved by day. The biggest advantage of this method is that both NaI (Tl) gamma and Ge (Li) gamma spectra are suitable.