Simulation of the response functions of an extended range neutron multisphere spectrometer using FLUKA

• Published in: Chinese physics C Vol. 39; no. 7; pp. 37 - 41
• Main Author: 王攀峰 丁亚东 王庆斌 马忠剑 郭思明 李冠稼
• Format: Journal Article
• Language: English
• Published: Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Sciences and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing 01.07.2015
• Subjects: Applications programs; Computer simulation; Detectors; energy response; FLUKA; Halls; He-filled spherical proportional counter; Mathematical models; neutron multisphere spectrometer; neutron spectrum; Response functions; Simulation; Spectrometers; 中子辐射; 函数模拟; 响应函数; 模拟计算; 程序模拟; 谱仪; 质子加速器; 量程
• ISSN: 1674-1137; 0254-3052
• DOI: 10.1088/1674-1137/39/7/076001

In this paper, the distribution of radiation field in the CSNS spectrometer hall at Dongguan, China, was simulated by the FLUKA program. The results show that the radiation field of the high energy proton accelerator is dominated by neutron radiation, with a broad range of neutron energies, spanning about eleven orders of magnitude.Simulation and calculation of the response functions of four Bonner spheres with a simplified model is done with FLUKA and MCNPX codes respectively, proving the feasibility of the FLUKA program for this application and the correctness of the calculation method. Using the actual model, we simulate and calculate the energy response functions of Bonner sphere detectors with polyethylene layers of different diameters, including detectors with lead layers, using the FLUKA code. Based on the simulation results, we select eleven detectors as the basic structure for an Extended Range Neutron Multisphere Spectrometer（ERNMS）.