... radioactive occurrence放射性矿床 radioactive mineral spring放射性矿泉 radioactive ore放射性矿石 ...
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所以要是你获得了放射性元素的正确类型矿石后，等上数十亿年（甚至数万亿年）就能获得地下隐藏着的大量氦！
So if you get an ore of the right type of radioactive element, and you wait millions and millions (or even billions) of years, you make a giant underground store of helium !
铅同位素结果研究表明，穆家庄铜矿矿石铅和近矿围岩岩石铅具有富含放射性成因铅的特点。
Lead isotope research shows that lead in ores of Mujiazhuang copper deposit and near ore country rocks is characterized by being rich in radioactive lead.
矿石样品放射性镭含量比岩石样品高19倍，为井下氡气的主要来源；
The content of radioactive radium in mineral was 19 times higer than that in rock and served as a chief source of radon.
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