利用高能缓发γ射线测定裂变数  

Determination of Nuclear Fission Number by High-Energy Delayedγ-rays

作　　者：杨洋[1,2] 冯晶[1] 杨毅[1] 刘世龙[1] 王朝辉[1] 苏晓斌[1] 侯龙[1] 

机构地区：[1]中国原子能科学研究院核数据重点实验室,北京102413 [2]兰州大学核科学与技术学院,甘肃兰州730000

出　　处：《原子能科学技术》2013年第4期517-522,共6页Atomic Energy Science and Technology

摘　　要：利用裂变产额法得到短时间辐照235 U样品的裂变总数,通过大体积NaI探测器测量3 MeV以上高能缓发γ射线总计数随时间的变化,从而得到一次裂变3MeV以上高能缓发γ射线总发射率随时间的变化规律,并给出脉冲辐照下高能缓发γ射线的发射率。通过高能缓发γ射线测量了两块235 U样品的裂变数,其相对不确定度小于4%。Fission numbers of 235U samples irradiated in short tlme were ootalneo uy fission yield method. The total emission rate of high-energy delayed γ-rays above 3 MeV per fission over time was measured by large volume NaI detector, and high-energy delayed γ-rays emission rate of pulse irradiation was gained. Fission numbers of two z35U samples were obtained by applying the emission rate of high-energy delayed γ-rays per fission, and the relative uncertainty is less than 4%.

关 键 词：缓发γ射线 裂变数 NaI探测器 

分 类 号：TL816[核科学技术—核技术及应用]