radioactivity unit

Noun
  1. A measure of radioactivity (synset 113656797)
    is a type of: electromagnetic unit, emu - any of various systems of units for measuring electricity and magnetism
    subtypes:
    • 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
    • gray, gy - 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
    • millirem, mrem - a dosage of ionizing radiation equivalent to one thousandth (1/1000) of a rem
    • rad - a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material

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