Design of a compact and portable space neutron spectrometer based on Monte Carlo

IF 1.6 3区 工程技术 Q3 CHEMISTRY, INORGANIC & NUCLEAR
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Abstract

With the rapid development of space exploration, the detection of space neutron radiation is becoming increasingly important. The currently widely used Bonner sphere spectrometer have drawbacks such as large size and weight, as well as low fault tolerance, when detecting space neutron spectra. This paper describes in detail a new type of space neutron spectrometer (SNS), which has two different specifications to adapt to the directional and non-directional neutron field environment, and can measure the directional neutron energy spectrum. For the directed neutron field, SNS integrates 12 3He thermal neutron counters (diameter 3 cm: 3, diameter 4 cm: 6, diameter 5 cm: 3) and uses cylindrical polyethylene as a moderator. For non-directed neutron fields, SNS integrates 9 3He thermal neutron counters (diameter 3 cm: 4, diameter 4 cm: 3, diameter 5 cm: 2) located in a single structure made of polyethylene, boron-containing polyethylene and gadolinium. The device is capable of providing a strong directional response in the energy range of thermal neutrons up to 20 MeV, with little sensitivity to neutrons coming from directions other than the axis of the cylinder. The Monte Carlo transport code FLUKA was used to determine the final configuration of the instrument, including the arrangement, number, and position of thermal neutron counters. In addition, the response matrix of the instrument was calculated using FLUKA code. This device can replace traditional Bonner sphere spectrometer for measuring space neutrons, and it also provides reference value for downsized and lightweight neutron spectrometers on the ground.

基于蒙特卡洛的紧凑型便携式空间中子能谱仪的设计
随着太空探索的快速发展,太空中子辐射探测变得越来越重要。目前广泛使用的邦纳球谱仪在探测空间中子能谱时存在体积大、重量大、容错能力低等缺点。本文详细介绍了一种新型空间中子能谱仪(SNS),它有两种不同的规格,以适应定向和非定向中子场环境,并能测量定向中子能谱。对于定向中子场,SNS 集成了 12 个 3He 热中子计数器(直径 3 厘米:3 个,直径 4 厘米:6 个,直径 5 厘米:3 个),并使用圆柱形聚乙烯作为慢化剂。对于非定向中子场,SNS 将 9 个 3He 热中子计数器(直径 3 厘米:4 个,直径 4 厘米:3 个,直径 5 厘米:2 个)集成在一个由聚乙烯、含硼聚乙烯和钆制成的单一结构中。该装置能够在高达 20 MeV 的热中子能量范围内提供强烈的定向响应,对来自圆柱体轴线以外方向的中子几乎不敏感。蒙地卡罗传输代码 FLUKA 被用来确定仪器的最终配置,包括热中子计数器的排列、数量和位置。此外,还使用 FLUKA 代码计算了仪器的响应矩阵。该装置可以替代传统的邦纳球谱仪测量空间中子,同时也为地面中子谱仪的小型化和轻量化提供了参考价值。
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来源期刊
Applied Radiation and Isotopes
Applied Radiation and Isotopes 工程技术-核科学技术
CiteScore
3.00
自引率
12.50%
发文量
406
审稿时长
13.5 months
期刊介绍: Applied Radiation and Isotopes provides a high quality medium for the publication of substantial, original and scientific and technological papers on the development and peaceful application of nuclear, radiation and radionuclide techniques in chemistry, physics, biochemistry, biology, medicine, security, engineering and in the earth, planetary and environmental sciences, all including dosimetry. Nuclear techniques are defined in the broadest sense and both experimental and theoretical papers are welcome. They include the development and use of α- and β-particles, X-rays and γ-rays, neutrons and other nuclear particles and radiations from all sources, including radionuclides, synchrotron sources, cyclotrons and reactors and from the natural environment. The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria. Papers dealing with radiation processing, i.e., where radiation is used to bring about a biological, chemical or physical change in a material, should be directed to our sister journal Radiation Physics and Chemistry.
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