People are exposed to natural radioactive materials every day from space (cosmic rays) and the soil, water and air. There also are manmade sources of radiation, such as X-rays and CT scans.

The radiation dose is expressed in units called a sievert (Sv). On average, a person is exposed to about 3.0 millisieverts a year. The radiation from a CT scan amounts to about 11 mSv.

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