Absorbed, equivalent and effective dose apply to individuals or average individuals. In order to assess the dose received by a group or population, it is useful to introduce the collective dose. It is obtained by summing up the individual doses of each person of the group considered. Its SI unit is man Sv. A collective dose of 1,000 man Sv corresponds to 1,000 people receiving each 1mSv or 10 people 100 mSv. This quantity is defined for a specific source of radiation or for a specific practice causing exposure, and is a convenient measure when considering nuclear accidents [UNSCEAR, 1993].
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