Rem (unit)
Last revised by Mateusz Wilczek
on 21 Mar 2025
Citation, DOI, disclosures and article data
Citation:
Bell D, Wilczek M, Rem (unit). Reference article, Radiopaedia.org (Accessed on 23 Mar 2025) https://doi.org/10.53347/rID-58614
Permalink:
rID:
58614
Article created:
Disclosures:
At the time the article was created Daniel J Bell had no recorded disclosures.
View Daniel J Bell's current disclosures
Last revised:
21 Mar 2025,
Mateusz Wilczek
Disclosures:
At the time the article was last revised Mateusz Wilczek had no financial relationships to ineligible companies to disclose.
View Mateusz Wilczek's current disclosures
Revisions:
4 times, by
2 contributors -
see full revision history and disclosures
Sections:
Synonyms:
- Roentgen equivalent man (rem)
- Millirem
- Microrem
- Roentgen equivalent man (unit)
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 (1 Sv = 100 rem) 1.
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.
References
- 1. Nelson R & Ruby L. Physiological Units in the SI. Metrologia. 1993;30(2):55-60. doi:10.1088/0026-1394/30/2/001
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