含硼铁精矿粉/环氧树脂复合材料射线屏蔽性能研究

Study on shielding properties of boron-containing iron ore concentrate powder/epoxy composite

以我国特有的含硼矿物经选矿后得到的含硼铁精矿粉作为中子吸收体与低粘度环氧树脂E51相复合,制备了一种低成本含硼铁精矿粉/环氧树脂复合屏蔽材料。测试了这种复合材料对慢中子和60Coγ射线的屏蔽性能,确定了满足射线屏蔽性能的含硼铁精矿粉与树脂的最佳配比范围。证明了以含硼铁精矿粉作为原料制备复合射线屏蔽材料是可行的。结果表明,3种配比的复合屏蔽材料其慢中子宏观截面均超过了宏观截面为Σ=0.158cm-1,以B4C为中子吸收体的铅硼聚乙烯屏蔽材料B201。此复合屏蔽材料的宏观截面最大值为Σ=0.1882cm-1,具备较好的慢中子屏蔽能力;对60Coγ射线的线性减弱系数最大值为μ=0.0772cm-1,屏蔽性能介于水和混凝土之间。

A low cost shielding material using boron-containing iron ore concentrate and low viscosity epoxy E51 as starting materials was developed.Boron-containing iron ore concentrate was got after green ore containing boron dressing which is specific in China.Experiments were performed in order to determine the characteristics of the low cost composite,such as slow neutron and ^60Co γ shielding performance.Confirmed the optimum mixture ratio of epoxy to boron-containing iron ore concentrate.Testified the feasibility of using boron-containing iron ore concentrate as starting material to prepare the shielding material.The results showed that slow neutron cross-section of three samples proportioning are all larger than lead-boron polyethylene shielding material B201,which cross-section is Σ=0.158cm^-1 and loaded with B4C as neutron absorber.The largest cross-section among the samples is Σ=0.1882cm^-1 and performs good slow neutron shielding ability.The ^60Co γ shielding performance is between water and concrete,the largest linear attenuation coefficient of samples is μ=0.0772cm^-1.