how is radon gas form ?
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Radon is a radioactive gas that forms naturally when uranium, thorium, or radium, which are radioactive metals break down in rocks, soil and groundwater. People can be exposed to radonprimarily from breathing radon in air that comes through cracks and gaps in buildings and homes.
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The gas moves up through the soil to the surface where it can enter homes, school and the workplace through cracks and other holes in the foundation. In some cases radon can enter building through well water and come from building materials.
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