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.

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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