放射物质

专家指出，危害性放射物质不会横跨太平洋，从而影响西岸地区。

Scientists say there is no chance that dangerous radiation will cross the Pacific .

冷却用过的核燃料至关重要，因为一旦它暴露在外，就可能引发锆火灾，从而排放出大量放射物质。

Cooling the spent fuel is critical , for if it becomes exposed , a zirconium fire can break out and spew massive amounts of radiation .

火警报警机，装有烟雾探测器，含放射物质

Fire-alarm , incorporating smoke detectors , containing a radioactive substance

在地幔深部，放射物质最高的可能浓度受溶点以下的温度条件所限制。

In the deep mantle the highest possible concentration of radioactive materials is limited by the condition demanding temperatures below the melting point .

非自动推进专门运送放射活性物质的铁道车

Not self-propelled railway car specially designed for carrying radioactive materials

清除受放射污染地区有害物质的过程

the process of decontaminating areas exposed to radioactivity