给出了一种用室内快速运动的球体作为放射性样品测量室内氡射气辐射活度的新方法。
A new method of measuring indoor radioactivity of radon is presented by using the indoor fast-moving ball as the sample of a radioactive substance.
锕射气氡的一种放射性的，惰性的和气态的同位素，其半衰期为3。92秒。
A radioactive, inert, gaseous isotope of radon, with a half - life of3.92seconds.
锕射气氡的一种放射性的，惰性的和气态的同位素，其半衰期为3。92秒。
A radioactive, inert, gaseous isotope of radon, with a half - life of3.92seconds.
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