对人类的危险程度和放射性是什么?
燃料储量丰富,过程安全,废料尽管有放射性,但同裂变产生的废料相比,有害程度要小得多。
The fuel is abundant, the process safe and the waste, though radioactive, is far less noxious than the stuff left over from fission.
西姆斯使用放射性计时器测定并比较氡的两种同位素,以此来解密火山的活跃程度。
Sims USES radioactive clocks to decipher volcanic processes, measuring and comparing two isotopes of radon.
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