已将其用于实践的目的，去鉴别元素和阐明放射性衰变系。
It had been used for practical ends, to identify elements and to unravel radioactive decay chains.
氡是天然放射性惰性气体，是铀系衰变链中的一个衰变产物。
As a product from the uranium disintegration, radon is a natural radioactive idle gas.
氡是天然放射性惰性气体，是铀系衰变链中的一个衰变产物。
As a product from the uranium disintegration, radon is a natural radioactive idle gas.
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