环保型钆硼柔性热中子吸收材料特性研究  

Characterization of Environmentally Friendly Gadolinium/BoronFlexible Thermal Neutron Absorbing Material

作　　者：王琦[1,2,3] 郭晓林 尹进南 王晓娟 原林 王博宇 方青龙 韩小祥 仇天祎 刘洋 WANG Qi;GUO Xiaolin;YIN Jinnan;WANG Xiaojuan;YUAN Lin;WANG Boyu;FANG Qinglong;HAN Xiaoxiang;QIU Tianyi;LIU Yang(Key Laboratory of Nuclear Data,China Institute of Atomic Energy,Beijing 102413,China;Engineering Research Center of Flexible Radiation Protection Technology,Xi’an 710048,China;Xi’an Key Laboratory of Nuclear Protection Textile Equipment Technology,Xi’an 710048,China;Xi’an Polytechnic University,Xi’an 710048,China;Unit 93147,Chengdu 610041,China)

机构地区：[1]中国原子能科学研究院核数据重点实验室,北京102413 [2]射线柔性防护技术陕西省高校工程研究中心,陕西西安710048 [3]西安市核防护纺织装备技术重点实验室,陕西西安710048 [4]西安工程大学,陕西西安710048 [5]93147部队,四川成都610041

出　　处：《原子能科学技术》2024年第6期1364-1371,共8页Atomic Energy Science and Technology

基　　金：陕西省教育厅重点科研计划项目(22JC034);西安市科技计划项目(22GXFW0042);陕西高校青年创新团队资助。

摘　　要：本文以聚苯乙烯-乙烯-丁二烯-苯乙烯(SEBS)为基体、以Gd_(2)O_(3)、B_(4)C为功能填料,研制了一种柔性热中子吸收材料。SEM测试结果表明,不同含量的材料中Gd_(2)O_(3)和B_(4)C微米颗粒分布相对均匀;XRD和FT-IR测试结果表明,Gd_(2)O_(3)、B_(4)C与基体SEBS未发生化学反应,属于物理性混合。通过实验和蒙特卡罗模拟进行热中子屏蔽性能验证,对照组材料的实验透射率为31.97%~35.35%,实验组材料的实验和模拟透射率分别为32.11%~36.54%和26.26%~31.31%。对实验组进行了热中子面透射率均匀性测试,结果表明,(10%Gd_(2)O_(3)+40%B_(4)C)/SEBS和(30%Gd_(2)O_(3)+40%B_(4)C)/SEBS材料的平均透射率分别为34.34%和31.60%,所有采样点的绝对偏差在±0.5%以内,标准差为0.33%和0.26%,离散系数为0.0096和0.0082。该柔性材料有效弥补了传统刚性射线屏蔽材料的不足,在核设施异形复杂结构表面包覆防护和可穿戴辐射防护服领域具有潜在应用价值。Generally,lead containing materials,polyethylene or epoxy resin matrix composites,stainless steel or alloy,ceramic or concrete are commonly selected for biological shielding,so as to reduce the neutron or gamma radiations below the limit level.However,these shielding materials are not able to be well attached to the peripheries of nuclear equipments or instruments with complex shapes because of their rigidity.Therefore,it is necessary to develop flexible radiation shielding materials for surface radiation hardening of some irregular structural components.Until recently,the concept of flexible radiation shielding material has aroused great interest of researchers because of their unique characteristics,and the conventional approach to prepare flexible neutron shielding composite is to add nano or micron composite containing elements with high thermal neutron absorption cross section as filler into the flexible polymer matrix.In this paper,a kind of flexible neutron absorbing material was developed by using polystyrene ethylene butadiene styrene(SEBS)as the matrix and Gd_(2)O_(3)as well as B_(4)C as functional fillers with different doping ratios through melt blending in an internal mixer.The microscopic properties of the material were characterized by SEM,EDS,XRD,and FT-IR,and the shielding performance was characterized by thermal neutron transmittance and areal uniformity tests.The results of SEM and EDS indicate that Gd_(2)O_(3)and B_(4)C micro particles are distributed uniformly in the SEBS matrix,achieving compatibility with SEBS and avoiding the problem of particle aggregation.The XRD and FT-IR results indicate that there is no chemical reaction between Gd_(2)O_(3),B_(4)C and SEBS to form chemical bond,and it belongs to a physical mixture.The thermal neutron shielding was verified through experiment and Monte Carlo simulation.The experimental transmittance of the control group material is 31.97%-35.35%,while the experimental and simulated transmittances of the experimental group material are 32.11%-36.54%and

关 键 词：钆 硼 中子防护 柔性材料 蒙特卡罗模拟 

分 类 号：TL77[核科学技术—辐射防护及环境保护]