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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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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