Coal with high radioactivity level and residue will be harmful to environment of storing site, affective the reuse of residue.

部分放射性核素较高的煤及产生的煤渣将会对堆放的环境以及煤渣的再利用产生一定影响。

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In addition, there also existed the hybridization of the crustal substance which contained OS with high radioactivity during the formation of the sulfide nickel deposit.

煎茶岭硫化镍矿床成矿过程中有含高放射性成因锇的壳源物质混染。

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The results show that the low gamma shale were deposited in the lake-flooding stage which inhibited the deposition of minerals with high radioactivity such ask-feldspar and mica.

研究表明，低伽马泥岩是在湖泛时期由于富含放射性的钾长石和云母等矿物受到抑制而沉积形成的。

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So what caused the Earth to briefly bathe in high levels of radioactivity?

FORBES: A Gamma Ray Burst May Have Irradiated 8th Century Earth

High burnup fuel rods stay hotter longer, emit more radioactivity, and may become brittle, scientists suspect, as the cladding that holds them together endures greater stresses.

FORBES: Fancy New Lids for Nuclear Waste Casks, As Contents Get Hotter