The röntgen equivalent in man or rem (symbol rem) is a unit of radiation dose. It is the product of the absorbed dose in röntgens (R) and the biological efficiency of the radiation. More precisely, assuming a radiation weighting factor rW=1, 1 rem equals 1.07185 röntgen. The conversion factor has been readjusted from 1 to 1.07185 so that 100 rem equal 1 sievert; the sievert is the recommended SI derived unit, and in many cases is the legally prescribed unit.

Continued use of the rem is "strongly discouraged" ^* by the National Institute of Standards and Technology.

A millirem (abbr. mrem) is one thousandth of a rem.

See radiation poisoning for a more complete analysis of effects of various dosage levels.

Units of radiation dose | Radiobiology

Rem (enhed) | Rem (Physik) | Rem | Rem | 인체 뢴트겐 당량 | Röntgen equivalent man | レム | Бэр (единица измерения)