| / English Dictionary |
RADIOACTIVITY UNIT
| Pronunciation (US): |  | (GB): | |
I. (noun)
Sense 1
Meaning:
A measure of radioactivity
Classified under:
Nouns denoting quantities and units of measure
Hypernyms ("radioactivity unit" is a kind of...):
electromagnetic unit; emu (any of various systems of units for measuring electricity and magnetism)
Hyponyms (each of the following is a kind of "radioactivity unit"):
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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