The ash contains minerals such as zircon that can be dated precisely from the radioactive decay of some of their components.
这些火山灰中含有锆石等矿物，这些矿物中的某些组分允许进行精确的放射性测年(以确定精确的年代数据)。
The unexpectedly vast fallout from the bomb enveloped a distant Japanese tuna trawler named the Lucky Dragon No. 5 in a blizzard of radioactive ash.
炸弹所产生的巨大的原子尘意外地将一艘名为福龙五号(Lucky DragonNo. 5)的日本拖渔船笼罩在强烈的放射性烟尘之下。
The reason is that the ash left over when coal is burned contains radioactive elements, notably uranium and thorium.
理由是煤燃烧过后省些的煤灰含有放射性元素，尤其是铀和钍。
The application and the present situation of radioactive pollution of fly-ash had been introduced. The radioactivity of fly-ash was potential harmful for the human health.
介绍了粉煤灰的应用和放射性污染现状，指出了粉煤灰的放射性对人体健康具有潜在威胁。
The application and the present situation of radioactive pollution of fly-ash had been introduced. The radioactivity of fly-ash was potential harmful for the human health.
介绍了粉煤灰的应用和放射性污染现状，指出了粉煤灰的放射性对人体健康具有潜在威胁。
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