名词
中文翻译：放射性活性
同义词：
['radioactive', 'radioactivity例句：1. Radioactivity is a measure of the amount of radiation emitted by a source.（放射性是衡量辐射源发射的辐射量。）']
例句：
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1. Radioactivity is a measure of the amount of radiation emitted by a source.
放射性是衡量辐射源发射的辐射量。
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2. The scientist studied the effects of radioactivity on living organisms.
科学家研究了放射性对活体生物的影响。
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3.The area around the reactor was heavily contaminated with radioactivity.
反应堆周围的区域被放射性物质严重污染。