单词	radioactivity
释义	radioactivity /ˌreɪdɪəʊakˈtɪvɪti / noun [mass noun] 1The emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei.Early studies of radioactivity revealed that certain atomic nuclei were naturally radioactive.... They may also interact with nonmedical regulations, such as limits on electromagnetic emissions or radioactivity. What makes dirty bombs particularly troublesome is that radioactivity, like fire, is something we deal with on a daily basis. 1.1Radioactive substances, or the radiation emitted by these: an escape of radioactivity... Small amounts of radioactivity escaped into the atmosphere. The lack of safeguards is leaving thousands of children across central Scotland at risk of thyroid cancer following an escape of radioactivity. They are comparing sediment taken from the Humber estuary - unpolluted by radioactivity - with other samples which contain the substance.
随便看	public-schoolboyish public schooling public-schoolish public-schoolishness public-schooly public sector public servant public service public-service corporation public service vehicle public speaker public speaking public spending public spirit public-spirited public-spiritedly public-spiritedness public state public statute public switched telephone network public telephone public toilet public transport public transportation public utility

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