Assessment of Five Concrete Types as Candidate Shielding Materials for a Compact Radiation Source Based on the IECF.
Assessment of Five Concrete Types as Candidate Shielding Materials for a Compact Radiation Source Based on the IECF.
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DOI：
10.3390/ma16072845
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发表时间：
2023-04-03
期刊：
影响因子：
--
通讯作者：
Bakr M
中科院分区：
文献类型：
--
作者：
Ahmed R;Saad Hassan G;Scott T;Bakr M
基于惯性静电约束聚变（IECF）系统的辐射源正被开发用于多学科研究。IECF系统的辐射输出是2.45 MeV的快中子和相关的能量小于3 MeV的共生成x射线。对五种类型的混凝土进行了辐射屏蔽研究，以确定系统屏蔽设计的最有效材料。提议的材料是钛铁矿-磁铁矿混凝土（IMC）、普通混凝土-1 （OC-1）、含重晶石混凝土（BC）、普通混凝土-2 （OC-2）和含蛇纹石混凝土（SC）。采用数值模型确定了快中子的有效去除截面系数∑Rt和材料内光子的总质量衰减系数µm、半值层（HVL）、平均自由程（MFP）、有效原子序数（Zeff）和有效电子密度（Neff）。该模型考虑了辐射源能量和混凝土类型的材料特性。结果表明，当混凝土厚度为12 cm时，将入射中子通量衰减到初始值的1/100时，含蛇纹石混凝土的∑Rt最高；此外，BC显示，当混凝土厚度为38 cm时，将3 MeV能量的x射线通量衰减到初始值的1/100所需的最大µm。该研究表明，40厘米厚度的SC或BC足以屏蔽IECF系统产生的辐射，最大粒子产生速率可达1 × 107 n/s。
A radiation source based on the inertial electrostatic confinement fusion (IECF) system is being developed for multidisciplinary research applications. The radiation outputs from the IECF system are 2.45 MeV fast neutrons and the associated co-generated X-rays with an energy less than 3 MeV. A radiation shielding study has been performed on five types of concrete to define the most efficient material for the shielding design of the system. The proposed materials were ilmenite-magnetite concrete (IMC), ordinary concrete-1 (OC-1), barite-containing concrete (BC), ordinary concrete-2 (OC-2), and serpentine-containing concrete (SC). A numerical model was applied to determine the effective removal cross-section coefficients (∑Rt) for the fast neutrons and the total mass attenuation coefficients (µm), the half-value layer (HVL), the mean free path (MFP), the effective atomic number (Zeff), and effective electron density (Neff) for photons inside the materials. The model considered the radiation source energy and the material properties of the concrete types. The results revealed that the serpentine-containing concrete exhibited the highest ∑Rt with 12 cm of concrete thickness needed to attenuate an incident neutron flux to 1/100 of its initial value. In addition, the BC shows the highest µm with a 38 cm concrete thickness needed to attenuate the 3 MeV energy X-ray flux to 1/100 of its initial value. This study suggests that a 40 cm thickness of SC or BC adequately shields the radiation generated from an IECF system with a maximum particle production rate of up to 1 × 107 n/s.
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