Roentgen Equivalent Man 1 : (rem) The unit of dose of any ionizing radiation which produces the same biological effect as one unit of absorbed dose of ordinary X-ray or gamma ray dosage
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}