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Radiation from a tiny particle of, say, plutonium is averaged over the entire body to give a dosage in units of (milli-) sieverts .
The potential for radiation to cause biological damage is called the dose equivalent, which is measured in rems or sieverts , where 1 sievert equals 100 rems.
All doses are expressed as dose equivalents in sieverts (Sv).
The unit of this weighted dose is the sievert , Sv, and it is termed the equivalent dose.
The International Commission on Radiological Protection recommends using a nominal risk coefficient of 5% per sievert , which is increased threefold to account for the higher radiosensitivity of infants.
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