Radon comes from radium decay.

氡来自镭的衰变。

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It is produced from radium in the decay chain of uranium, an element found in varying amounts in all rocks and soil.

它产生于铀衰变链中的镭，而铀是所有岩石和土壤中都能找到的一种元素，含量各不相同。

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Radon is a gas that comes from the radioactive decay of radium in rocks.

氡是来自岩石中镭辐射衰变而产生的气体。

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Checking data collected at Brookhaven National Laboratory on Long Island and the Federal Physical and Technical Institute in Germany, they came across something even more surprising: long-term observation of the decay rate of silicon-32 and radium-226 seemed to show a small seasonal variation.

FORBES: Radioactive Decay Rates May Not Be Constant After All