密闭实验大厅内散射中子注量的模拟研究
发布时间：2019-05-15 16:43
【摘要】：为能够快速评判实验测试方案和预估实验结果,建立了中子体通量的快速估算模型。理论上,封闭空间中子平均体通量与特征长度的平方成反比,且中子体通量的大小能反映散射中子注量强弱。采用蒙特卡罗模拟方法,计算得到了密闭实验大厅内中子的体通量,以及不同位置处的散射中子注量,并将模拟得到的体通量和散射中子注量拟合成便于工程实践中应用的解析表达式,拟合结果与模拟结果的相对偏差小于10%。研究结果表明,球形空间内中子的体通量与球半径的1.905次方成反比;密闭实验大厅的中子体通量与大厅横截面宽度的1.948次方成反比,与长宽比的0.775次方成反比;球形空间结构内,每个源中子的平均径迹长度约为半径的5.4倍,而长方体密闭实验大厅内,单个源中子的平均径迹长度为大厅特征尺度的2~3倍。
[Abstract]:In order to evaluate the experimental test scheme and predict the experimental results quickly, a rapid estimation model of neutron flux is established. In theory, the average volume flux of neutrons in closed space is inversely proportional to the square of the characteristic length, and the flux of neutrons can reflect the intensity of scattered neutrons. By using Monte Carlo simulation method, the bulk flux of neutrons in the closed experimental hall and the amount of scattered neutrons at different positions are calculated. The simulated volume flux and scattered neutron flux are simulated to synthesize the analytical expressions which are convenient for application in engineering practice, and the relative deviation between the fitting results and the simulation results is less than 10%. The results show that the volume flux of neutrons in spherical space is inversely proportional to the 1.905 power of the radius of the sphere, and the flux of neutrons in the closed experimental hall is inversely proportional to the 1.948 power of the cross section width of the hall and inversely proportional to the 0.775 power of the aspect ratio. In the spherical spatial structure, the average track length of each source neutrons is about 5.4 times of the radius, while in the cuboid closed experimental hall, the average track length of a single source neutrons is 2 鈮，
本文编号：2477638
[Abstract]:In order to evaluate the experimental test scheme and predict the experimental results quickly, a rapid estimation model of neutron flux is established. In theory, the average volume flux of neutrons in closed space is inversely proportional to the square of the characteristic length, and the flux of neutrons can reflect the intensity of scattered neutrons. By using Monte Carlo simulation method, the bulk flux of neutrons in the closed experimental hall and the amount of scattered neutrons at different positions are calculated. The simulated volume flux and scattered neutron flux are simulated to synthesize the analytical expressions which are convenient for application in engineering practice, and the relative deviation between the fitting results and the simulation results is less than 10%. The results show that the volume flux of neutrons in spherical space is inversely proportional to the 1.905 power of the radius of the sphere, and the flux of neutrons in the closed experimental hall is inversely proportional to the 1.948 power of the cross section width of the hall and inversely proportional to the 0.775 power of the aspect ratio. In the spherical spatial structure, the average track length of each source neutrons is about 5.4 times of the radius, while in the cuboid closed experimental hall, the average track length of a single source neutrons is 2 鈮，
本文编号：2477638
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