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radioactivity unit

Definitions of radioactivity unit
  1. noun
    a measure of radioactivity
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    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
    type of:
    electromagnetic unit, emu
    any of various systems of units for measuring electricity and magnetism
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