Rem
The Roentgen Equivalent Man or REM is an older, non-SI unit of dose equivalent.[1] Depending on the effect under study, REM can also be referred to as roentgen equivalent mammal.[2] Measuring the quantity of radiation damage on human tissue by x-rays, gamma or any other type of ionizing radiation such as alpha and beta radiation.[1] However, REM does not measure the amount of energy absorbed or the amount of ionization accumulated.[3] REM was first proposed in 1945 before Sievert was an established SI unit. One hundred rem can be defined as one Sievert or 1 rem = 1 cSv = 10-2 Sv.[4]
The following table shows radiation quantities in SI and non-SI units.[5][6]
| Quantity | Name | Symbol | Unit | System |
|---|---|---|---|---|
| Exposure | Roentgen | R | 2.58x10-6 C/kg | Non-SI |
| Absorbed Dose | Rad | rad | 10-2 Gy | Non-SI |
| Gray | Gy | Jkg-1 | SI | |
| Activity | Curie | Ci | 3.7x1010 Bq | Non-SI |
| Becquerel | Bq | s-1 | SI | |
| Dose Equivalent | Roentgen Equivalent Man | rem | 10-2 Sv | Non-SI |
| Sievert | Sv | Jkg-1 | SI |
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References
- ↑ 1.0 1.1 U.S.NRC. (2016, June 21).REM (Roentgen equivalent man) [Online]. Available: http://www.nrc.gov/reading-rm/basic-ref/glossary/rem-roentgen-equivalent-man.html
- ↑ S.T. Cantril et al., “The Tolerance Dose,” United States Atomic Energy Commission, Argonne National Laboratory, Technical Information Division, Oak Ridge, Tenn. MDDC-1100. 1945.
- ↑ E.E. Anderson. “Units of Radiation and Radioactivity.” Public Health Reports, Oak Ridge National Laboratory, Oak Ridge, Tenn. Vol. 67, No. 3, March 1952. Available:http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2030726/pdf/pubhealthreporig01075-0073.pdf
- ↑ U.S.NRC. (2015, December 02). Units od radiation dose [Online]. Available: http://www.nrc.gov/reading-rm/doc-collections/cfr/part020/part020-1004.html
- ↑ NIST. (2016, February 10). Chapter 5. Guide to the SI, Units Outside the SI [Online]. Available: http://www.nist.gov/pml/pubs/sp811/sec05.cfm
- ↑ NIST. (2016, February 19). Chapter 4. Guide to the SI, The Two Classes of SI Units and the SI Prefixes [Online]. Available: http://www.nist.gov/pml/pubs/sp811/sec04.cfm