radioactive mineral

基本解释

The discovery also explains why helium is found in radioactive mineral deposits.
这个发现也解释了为什么在放射性矿渣中找到了氦。
dict.cn
The content of radioactive radium in mineral was 19 times higer than that in rock and served as a chief source of radon.
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；
It results from cosmic rays reaching the earth from the outer space, and from the radioactive decay of mineral in the soil.
它来自星际空间抵达地球的宇宙射线，来自土壤中矿物质的放射性衰变。