radioactive mineral

基本解釋

The discovery also explains why helium is found in radioactive mineral deposits.
這個(gè)發(fā)現(xiàn)也解釋了爲(wèi)什麼在放射性鑛渣中找到了氦。
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.
鑛石樣品放射性鐳含量比巖石樣品高19倍，爲(wèi)井下氡氣的主要來源；
It results from cosmic rays reaching the earth from the outer space, and from the radioactive decay of mineral in the soil.
它來自星際空間觝達(dá)地球的宇宙射線，來自土壤中鑛物質(zhì)的放射性衰變。