Marie Curie, now at the highest point of her fame and, from 1922, a member of the Academy of Medicine, researched the chemistry of radioactive substances and their medical applications.

居里夫人现在的名气到达顶峰，从1922年开始，她是医学学会的成员，研究放射性物质的化学性质及其医学应用。

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They do not protect against external radiation, or against any other radioactive substances besides radioactive iodine.

他们不能阻止外部的辐射、或是任何其他辐射形式。

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Unfortunately, there is no question that radioactive substances are leaking into the atmosphere from the Fukushima nuclear power plant.

不幸的是，放射性物质无疑正从福岛核电站泄漏到大气中。

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After poring over the data, engineers and physicists noted a recurring pattern 33 days long that affected the decay rates of the various radioactive substances.

FORBES: Radioactive Decay Rates May Not Be Constant After All

Japanese military planes were also dispatched to collect air samples above Japan for traces of radioactive substances that could have been released as a result of the test.

WSJ: North Korea Tests Nuclear Device