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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

abstraction, abstract entity go
a general concept formed by extracting common features from specific examples

measure, quantity, amount go
how much there is or how many there are of something that you can quantify

definite quantity go
a specific measure of amount

unit, unit of measurement go
any division of quantity accepted as a standard of measurement or exchange

emu, electromagnetic unit go
any of various systems of units for measuring electricity and magnetism

radioactivity unit
a measure of radioactivity

noun.quantity

7 Subcategories

millicurie go
a unit of radioactivity equal to one thousandth of a curie
curie, Ci go
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 go
the SI unit of energy absorbed from ionizing radiation
R, roentgen go
a unit of radiation exposure
rutherford go
a unit strength of a radioactive source equal to one million disintegrations per second
REM go
(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 go
a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material