The set of BN thimbles are used for radiation prevention, and can effectively reduce the energy loss caused by heat radiation.

利用多层BN套管组作为辐射 蔽罩、有效地降低热辐射所致的能量损失。

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The inventive radiation prevention facing material has good electro-magnetic screen effect, permanent radiation protection function and low production cost.

本发明的防辐射面料电磁屏蔽效果好，具有永久防辐射功能，且生产成本低。

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Analysis and evaluation were carried out on the safety grade of the radiation source, radiation prevention site and the exposure dose level of the working staff.

方法通过现场监测，按照标准对辐射源安全级别，场所辐射防护区域，工作人员接受的剂量水平进行分析评价。

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The prevention of further hydrogen explosions is seen as a priority, because blasts could spew more radiation and damage the reactors.

BBC: Japan quake: Nitrogen pumped into nuclear reactor