物理学报Issue(16)：1-8,8.DOI:10.7498/aps.63.162501
离线测量钍快中子裂变反应率方法
Determination of thorium fission rate by off-line metho d
摘要
Abstract
Thorium fission reaction rate is an important datum in uranium-thorium fuel cycle. In order to measure the thorium fission rate on the thorium sample equipment which is set up by the conceptual design of the subcritical reactor and to check the thorium data, the off-line activation γ measurement method of thorium fission rate is developed. Combined with thorium fission yield data of 85mKr, the 232Th fission reaction rate distribution in thorium sample device can be obtained by measuring the 151.16 keV feature gamma rays emitted by fission fragment 85mKr. Details of the principles and factors of this method are discussed, and the verification experiment is carried out on a depleted uranium shell of R13.1/30.0 cm with D-T neutrons. The relative uncertainty of experiment is 5.3%-5.5% for thorium fission reaction rates. The experiment is simulated using MCNP5 with ENDF/B-VI and ENDF/B-VII libraries, simulation results and experimental results accord well with each other within the experimental uncertainty, showing that this approach developed in this paper can work well for determining the thorium fission rate.关键词
钍/裂变率/离线测量Key words
thorium/fission rate/off-line measurements引用本文复制引用
冯松,刘荣,鹿心鑫,羊奕伟,王玫,蒋励,秦建国..离线测量钍快中子裂变反应率方法[J].物理学报,2014,(16):1-8,8.基金项目
国家自然科学基金(批准号:91226104)资助的课题.* Project supported by the National Natural Science Foundation of China (Grant No.91226104) （批准号:91226104）
