Ghodke Shobha, V Sathian, Singh Yashoda, Santra S
Radiation Safety Systems Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India.
Radiation Safety Systems Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India.
Appl Radiat Isot. 2022 Jun;184:110171. doi: 10.1016/j.apradiso.2022.110171. Epub 2022 Mar 1.
The efficiencies of a proton recoil neutron telescope for neutron energies ranging from 4 MeV to 20 MeV were calculated for different geometries given by Bame et al., for the case of an isotropic point neutron source colinear with the radiator and charge particle detector that are parallel & coaxial to each other. An analytical expression for the efficiency was obtained as a function of the radiator size, detector aperture, source-radiator & radiator-detector distances and n-p differential scattering cross section. The relativistic transformation of n-p differential scattering cross section from center-of-mass to laboratory system was used in the calculations, taking into account the angular anisotropy of the n-p scattering. The accuracies of the calculations were checked by comparing with published efficiency values by Thomas & Axton and Bame et al. The difference between calculated and published efficiencies were small and, in most cases, it was below 1%. Finally, efficiency of the telescope was calculated using the latest n-p scattering cross section data from the evaluated nuclear data file (ENDF) VII for neutron energies ranging from 4 MeV to 20 MeV.
针对由巴姆等人给出的不同几何结构，计算了质子反冲中子望远镜对于能量范围在4兆电子伏至20兆电子伏的中子的效率，该情况为各向同性点中子源与散热器及带电粒子探测器共线，且散热器和探测器相互平行并同轴。得到了一个作为散热器尺寸、探测器孔径、源-散热器及散热器-探测器距离以及n-p微分散射截面函数的效率解析表达式。计算中使用了n-p微分散射截面从质心系到实验室系的相对论变换，并考虑了n-p散射的角各向异性。通过与托马斯和阿克斯顿以及巴姆等人发表的效率值进行比较来检验计算的准确性。计算效率与发表效率之间的差异很小，在大多数情况下低于1%。最后，利用来自评估核数据文件（ENDF）VII的最新n-p散射截面数据，计算了能量范围在4兆电子伏至20兆电子伏的中子的望远镜效率。
