As radon progeny decay, they emit radioactive alpha particles and attach to aerosols, dust and other particles in the air.

氡子核在衰变时发射出放射性阿尔法粒子，这些粒子可附着于空气中的浮质、灰尘及其它粒子。

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Its purpose is not to shield radioactive emissions but to prevent the release of radioactive dust and other materials, and to keep out rainwater, which could carry contaminants into the water table.

它的作用不是用来遮挡放射性排放而是阻止放射性烟尘和其它物质的释放，以及遮挡雨水以防止雨水携带污染物流入地下水。

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And air movement must be minimized to avoid stirring up and resurrecting the bane of shelter workers, radioactive dust.

空气流动也要尽可能的被控制在最低限度，以避免放射性尘埃被搅动起来对工人们造成再次伤害。

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The danger from nuclear waste comes mainly from dust-like particles containing radioactive isotopes of iodine, cesium and strontium that could be released if the reactor fuel is allowed to become too hot.

FORBES: Fear Of Japan's Radiation Is Overdone

Radioactive isotopes accumulate in milk after they spread through the atmosphere, fall to earth in rain or dust, and settle on vegetation, where they are ingested by grazing cattle.

FORBES: Radiation Detected In Drinking Water In 13 More US Cities, Cesium-137 In Vermont Milk