摘要
开展了有源符合中子法探测235U富集度为90.34%的小圆柱状金属铀块裂变材料的方法与技术研究。使用有源井型中子符合计数装置测量金属铀块中235U受Am-Li中子源诱发后产生的裂变中子,运用最小二乘法的计算方法将测得的中子总计数率、真符合计数率分别与金属铀块质量做线性拟合,其线性相关性系数达0.999;在此基础上,进一步测量了在相同质量金属铀的条件下不同源、样距及不同样品形状的中子计数变化趋势。
A small column of Uranium fission material, which contains 90. 34%235U, is detected by active coincidence neutron counting in this study. An active well coincidence counter is used to measure the fission neutrons from 235U induced by Am-Li neutron source. The linear correlation coefficient comes to 0. 999 after a linear recombination is performed between the mass of uranium metal and real coincidence counts rate, total neutron counts rate calculated by least square method respectively. Fur-ther more, it is determined the trend of neutron counts varying with different sample shapes, the distances between neutron source and sample while keeping the Uranium quality a constant.
出处
《核电子学与探测技术》
CAS
CSCD
北大核心
2004年第6期726-728,共3页
Nuclear Electronics & Detection Technology
