Calculated neutron and gamma-ray energy spectra from 14-MeV neutrons streaming through an iron duct: comparison with experiment
Calculated neutron and gamma-ray energy spectra from 14-MeV neutrons streaming through an iron duct: comparison with experiment
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计算出流过铁管的 14 MeV 中子的中子和伽马射线能谱：与实验的比较
DOI：
10.13182/nse82-a18972
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发表时间：
1982
期刊：
影响因子：
--
通讯作者：
J. S. Tang
中科院分区：
文献类型：
--
作者：
R. Santoro;R. Alsmiller;J. Barnes;G. Chapman;J. S. Tang
积分实验，测量约流。14 MeV中子通过直径为0.30 m的铁导管（L/D约为3)在橡树岭国家实验室进行了一项研究。计算和测量的中子和伽马射线能谱进行比较，在16个检测器的位置上和关闭的圆柱轴的管道。使用NE-213液体闪烁体探测器，脉冲形状歧视，同时解决中子和伽马射线事件的测量光谱。使用计算机代码网络，结合两种辐射传输方法：离散纵坐标（与P/分3/多群截面）和蒙特卡罗（与连续点截面）的计算光谱。这两种辐射输运方法需要正确地解释从管道到探测器的单个散射中子。根据探测器位置和中子能量，计算和测量的850千电子伏以上的出射中子能谱在5%至50%范围内一致。750 keV以上的计算和测量的伽马射线谱也是有利的协议，约。5 - 50%，取决于探测器位置和伽马射线能量。
Integral experiments that measure the streaming of approx. 14 MeV neutrons through a 0.30-m-diameter iron duct (L/D approx. 3) imbedded in a concrete shield have been carried out at the Oak Ridge National Laboratory. Calculated and measured neutron and gamma-ray energy spectra are compared at sixteen detector locations on and off the cylindrical axis of the duct. The measured spectra were obtained using an NE-213 liquid scintillator detector with pulse-shape discrimination to simultaneously resolve neutron and gamma ray events. The calculated spectra were obtained using a computer code network that incorporates two radiation transport methods: discrete ordinates (with P/sub 3/ multigroup cross sections) and Monte Carlo (with continuous-point cross sections). The two radiation transport methodologies are required to properly account for neutrons that single scatter from the duct to the detector. The calculated and measured outgoing neutron energy spectra above 850 keV agree within 5 to 50% depending on detector location and neutron energy. The calculated and measured gamma ray spectra above 750 keV are also in favorable agreement, approx. 5 to 50%, depending on detector location and gamma ray energy.