Editing Roentgen equivalent man (section)

==History==
The concept of the rem first appeared in literature in 1945<ref>{{cite web|last1=Cantrill|first1=S.T|author2=H.M. Parker|title=The Tolerance Dose|date=1945-01-05|url=http://oai.dtic.mil/oai/oai?verb=getRecord&metadataPrefix=html&identifier=ADA322447|archive-url=https://web.archive.org/web/20121130121433/http://oai.dtic.mil/oai/oai?verb=getRecord&metadataPrefix=html&identifier=ADA322447|url-status=dead|archive-date=30 November 2012|access-date=14 May 2012|publisher=US Atomic Energy Commission|location=Argonne National Laboratory}}</ref> and was given its first definition in 1947.<ref>{{cite journal|journal=Nucleonics|year=1947|volume=1|issue=2}}</ref> The definition was refined in 1950 as "that dose of any ionizing radiation which produces a relevant biological effect equal to that produced by one [[Roentgen (unit)|roentgen]] of high-voltage x-radiation."<ref>{{cite journal|last=Parker|first=H.M.|title=Tentative Dose Units for Mixed Radiations|journal=Radiology|year=1950|volume=54|issue=2|pages=257–262|doi=10.1148/54.2.257|pmid=15403708}}</ref> Using data available at the time, the rem was variously evaluated as 83, 93, or 95 [[erg]]/gram.<ref>{{cite journal|last=Anderson|first=Elda E.|title=Units of Radiation and Radioactivity|journal=Public Health Reports|date=March 1952|volume=67|issue=3|pages=293–297|doi=10.2307/4588064|pmc=2030726|pmid=14900367|jstor=4588064}}</ref> Along with the introduction of the rad in 1953, the ICRP decided to continue the use of the rem. The US [[National Committee on Radiation Protection and Measurements]] noted in 1954 that this effectively implied an increase in the magnitude of the rem to match the rad (100 erg/gram).<ref>{{cite book|title=Permissible Doses from External Sources of Radiation|publisher=US Department of Commerce|url=http://www.orau.org/ptp/Library/NBS/NBS%2059%20Addendum.pdf|access-date=14 November 2012|page=31|date=24 September 1954|series=National Bureau of Standards Handbook|volume=59}}</ref> The ICRP introduced and then officially adopted the rem in 1962 as the unit of equivalent dose to measure the way different types of radiation distribute energy in tissue and began recommending values of [[relative biological effectiveness]] (RBE) for various types of radiation.<ref>{{Cite journal |last=Pradhan |first=A. S. |date=2007 |title=Evolution of dosimetric quantities of International Commission on Radiological Protection (ICRP): Impact of the forthcoming recommendations |journal=Journal of Medical Physics |volume=32 |issue=3 |pages=89–91 |doi=10.4103/0971-6203.35719 |doi-access=free |issn=0971-6203 |pmc=3000504 |pmid=21157526}}</ref> In practice, the unit of rem was used to denote that an RBE factor had been applied to a number which was originally in units of rad or roentgen.

The [[International Committee for Weights and Measures]] (CIPM) adopted the sievert in 1980 but never accepted the use of the rem. The NIST recognizes that this unit is outside the SI but temporarily accepts its use in the U.S. with the SI.<ref name="fedreg63" /> The rem remains in widespread use as an industry standard in the U.S.<ref>''Handbook of Radiation Effects'', 2nd edition, 2002, Andrew Holmes-Siedle and Len Adams</ref> The United States [[Nuclear Regulatory Commission]] still permits the use of the units [[Curie (unit)|curie]], rad, and [[rem (unit)|rem]] alongside SI units.<ref>{{cite book|title=10 CFR 20.1003|year=2009|publisher=US Nuclear Regulatory Commission|url=https://www.nrc.gov/reading-rm/doc-collections/cfr/part020/part020-1004.html}}</ref>