Using fly ash as a tracer overcomes the limitation that the 137cs tracer method has in explaining the processes of soil redistribution prior to a nuclear explosion in the atmosphere.

燃煤飞灰(以下简称飞灰)作为时间标记物克服了放射性同位素137cs示踪方法不能鉴定大气核爆炸之前的土壤再分布过程这一缺陷。

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The man he is replacing - Sir John Beddington - had to provide advice on Japan's Fukushima nuclear accident, Iceland's volcanic ash eruption and the spread of Ash dieback.

BBC: The man who gives away ?600m a year