【作者】 刘素萍； 胡广春； 伍怀龙； 储诚胜； 刘钊； 曾军； 向清沛； 丁阁；

【Author】 LIU Su-ping;HU Guang-chun;WU Huai-long;CHU Cheng-sheng;LIU Zhao;ZENG Jun;XIANG Qing-pei;DING Ge;Institute of nuclear physics and chemistry,China academy of engineer physics and chemistry;

【机构】 中国工程物理研究院核物理与化学研究所；

【摘要】 本文选取了对14 MeV中子诱发²³⁸U核裂变所产生的感兴趣区域（3⁸MeV）缓发γ射线有主要贡献的7种裂变产物,构成研究总体,在不同辐照时间的情况下,计算了不同时刻总体感兴趣区域缓发γ射线的总强度,研究了有效半衰期的特点,分析了有效半衰期作为核材料判据的必要性和作用。研究表明,有效半衰期具有随跟踪测量开始时刻变化、随辐照条件变化的特点,作为核材料存在判据之一,有效半衰期可以用来辅助证实核材料的存在。更多还原

【Abstract】 Seven fission products which are dominant contributors to delayed gamma rays above 3MeV have been chosen to compose a study population.Total intensities of the delayed gamma rays above 3 MeV from the study population have been calculated at different time and with different beam-on durations.Features of effective half-lives(EHLs) have been investigated,and necessities and functions for EHLs being used as an evidence of nuclear material presence have also been ana lyzed.The study shows that EHLs have features of varying with beam-off time and with irradiation conditions,and that the EHLs can be used as an accessorial evidence to prove the presence of nuclear materials.更多还原