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Possible Answers: REM.
Random information on the term “REM”:
The roentgen equivalent in man (or mammal:579) (abbreviated rem; symbol rem, or often but incorrectly R) is an older, CGS, unit of equivalent dose, effective dose, and committed dose. Quantities measured in rem are designed to represent the stochastic biological effects of ionizing radiation, primarily radiation-induced cancer. These quantities are a complex weighted average of absorbed dose, which is a clear physical quantity measured in rads. There is no universally applicable conversion constant from rad to rem.
Taken from Wikipedia