Where does Radon come from?

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According to the US EPA,  Radon comes from the decay of Uranium-238 as part of the decay chain.

As the earth's crust was formed, Uranium was distributed within it. Thus radon is a natually occurring radioactive gas that is produced by the breakdown of uranium in rock, soil and water. Given the age of the earth, uranium's slowly progressing decay chain now commonly produces radon-222. The biggest health problems arethat radon is raioactive, and it is a gas. As a gas it can seep through foundations into homes (particularly basements), and accumulate into fairly high concentrations. It is drawn into homes because the air pressure inside your home is usually lower than the pressure in the soil around your home's foundation. Due to this pressure difference, your home acts like a vacuum, draging radon in through any foundation cracks, or other openings. In the United States, radon gas in soils is the principal source of elevated radon levels in homes. Radon decay emits alpha particles, the radiation that presents the greatest hazard to lung tissue. Since radon had a very short half-life (3.8 days) that means that it emits alpha particles at a high rate. Radon is estimated to cause many thousands of lung cancer deaths each year. In fact, the Surgeon General has warned that radon is the second leading cause of lung cancer in the United States.

Please check out http://www.epa.gov/rpdweb00/understand/chain.html for more detailed information

According to the US EPA,  Radon comes from the decay of Uranium-238 as part of the decay chain.

As the earth's crust was formed, Uranium was distributed within it. Thus radon is a natually occurring radioactive gas that is produced by the breakdown of uranium in rock, soil and water. Given the age of the earth, uranium's slowly progressing decay chain now commonly produces radon-222. The biggest health problems arethat radon is raioactive, and it is a gas. As a gas it can seep through foundations into homes (particularly basements), and accumulate into fairly high concentrations. It is drawn into homes because the air pressure inside your home is usually lower than the pressure in the soil around your home's foundation. Due to this pressure difference, your home acts like a vacuum, draging radon in through any foundation cracks, or other openings. In the United States, radon gas in soils is the principal source of elevated radon levels in homes. Radon decay emits alpha particles, the radiation that presents the greatest hazard to lung tissue. Since radon had a very short half-life (3.8 days) that means that it emits alpha particles at a high rate. Radon is estimated to cause many thousands of lung cancer deaths each year. In fact, the Surgeon General has warned that radon is the second leading cause of lung cancer in the United States.

Please check out http://www.epa.gov/rpdweb00/understand/chain.html for more detailed information.

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