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.

According to the International Atomic Energy Agency(IAEA) Safety Standards, exposure to radiation is defined in terms of:

In a nuclear power plant accident, the general population is not likely to be exposed to doses high enough to cause such effects. Rescuers, first responders and nuclear power plant workers are more likely to be exposed to doses of radiation high enough to cause acute effects.

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