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|Noun||1.||radioactivity unit - a measure of radioactivity|
millicurie - a unit of radioactivity equal to one thousandth of a curie
Ci, curie - a unit of radioactivity equal to the amount of a radioactive isotope that decays at the rate of 37,000,000,000 disintegrations per second
Gy, gray - the SI unit of energy absorbed from ionizing radiation; equal to the absorption of one joule of radiation energy by one kilogram of matter; one gray equals 100 rad
R, roentgen - a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air
rutherford - a unit strength of a radioactive source equal to one million disintegrations per second
REM - (Roentgen Equivalent Man) the dosage of ionizing radiation that will cause the same amount of injury to human tissue as 1 roentgen of X-rays
rad - a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material
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