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millicurie
a unit of radioactivity equal to one thousandth of a curie
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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
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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
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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
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rutherford
a unit strength of a radioactive source equal to one million disintegrations per second
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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
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rad
a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material
