摘要
测量了中国原子能科学研究院游泳池反应堆热柱孔道外中子束的轴向和径向分布、超热中子谱及剂量参数。中子注量率随轴向距离增大而减小,其衰减规律与一个位于热柱孔道内之孔道轴线上某一点处的点源的情况相似;热中子与超热中子等效点源距热柱孔道口的距离分别为157和212em。采用E^(-α)与E(1′2)exp(-E/T)相结合的谱函数拟合超热中子谱,借助最小二乘法解谱而得出谱参数α:1.03,T=1.85MeV,平均能量约为0.97MeV。在3MW热功率下,距孔道口50cm处的热中子与超热中子注量率分别为1.61×10~7和6.1×10~4n/cm^2·s,剂量当量率分别为62和2.9cSv/h;热柱孔道口处的γ剂量当量率约为60cSv/h。
The axial and radial distribution, epithermal energy spectrum and dose equivalent rate of thermal column beam resulting from SPR have been determined in the Institute of Atomic Energy.The results show that the neutron fluence rate along the axial direction decreases as the distance increases outside the thermal column channel, and the trend of fluence rate attenuation follows approximately the inverse square law of a point source.When the reactor thermal power rate is 3MW, at a distance of 50cm to the channel, the thermal and epithermal neutron fluence rate are about 1.61×10~7 and 6.1×10~4n/cm^2·s respectively; dose equivalent rates are some 62 and 2.9cSv/h respectively, At the end of the chennal,γ dose equivalent rate is 60cSv/h or so.
出处
《核科学与工程》
CSCD
北大核心
1991年第1期49-54,6-7,共6页
Nuclear Science and Engineering
