Rem (unit)

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The rem (an acronym for roentgen equivalent man) was the cgs unit of effective dose and was officially replaced by the sievert many years ago.

One rem was a large quantity of radiation, and therefore for practical day to day use the millirem (mrem), representing one-thousandth of a rem, was usually employed.

History and etymology

It is named after Wilhelm Roentgen, the discoverer of x-rays.

Imaging physics