One of the mysteries of the English language finally explained.
A unit of effective absorbed dose of ionizing radiation in human tissue, loosely equivalent to one roentgen of X-rays.
- ‘The modern international system of units includes the Gray, the Sievert, and the Becquerel (Bq); these replace the rad, rem, and Curie, respectively.’
- ‘According to Badhwar, the total increase in cosmonaut exposure was about 6 or 7 rem, a dose equivalent to 100 to 150 days of additional radiation exposure.’
- ‘The rem takes account of a ‘quality factor’, which for the more dangerous alpha particles is 10.’
- ‘An area in which radiation levels could result in an individual receiving a dose equivalent in excess of 0.1 rem per hour.’
1940s: acronym from roentgen equivalent man.
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