Röntgen equivalent man

The röntgen (roentgen) 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. A rem is a large amount of radiation, so the millirem (mrem), which is one thousandth of a rem, is often used for the dosages commonly encountered, such as the amount of radiation received from medical x-rays and background sources. Continued use of the rem is "strongly discouraged" [http://physics.nist.gov/Pubs/SP811/sec05.html#5.2] by the style guide of the US National Institute of Standards and Technology for authors of its publications [http://physics.nist.gov/cuu/pdf/sp811.pdf] . See radiation poisoning for a more complete analysis of effects of various dosage levels.

ee also

*Rad (unit)
*Röntgen
*Space radiation