计量院中子屏蔽室墙壁板（含硼聚乙烯板）Wall board of neutron shielding room in Metrology Institute

计量院中子屏蔽室墙壁板（含硼聚乙烯板）在含硼聚乙烯中，主要是硼起吸收作用。硼对低能中子的反应截面比较大，在还没有发生氢的反应之前低能中子基本已被硼完全吸收，含硼聚乙烯在质量百分比为10﹪、厚度为15cm时，含硼聚乙烯对中子的防护效果已达到要求。在此基础上再增加含硼量或者厚度，中子的积分泄露量基本不发生变化

In boron containing polyethylene, boron plays an important role in absorption. The reaction cross-section of boron to low-energy neutrons is relatively large. Before hydrogen reaction, low-energy neutrons have been completely absorbed by boron. When the mass percentage of boron containing polyethylene is 10% and the thickness is 15 cm, the protection effect of boron containing polyethylene on neutron has reached the requirements. On this basis, if the boron content or thickness is increased, the integral leakage of neutron does not change

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