RADIOACTIVITY.EU.COM

icon THE PHENOMENON
THE PHENOMENON
icon IN DAILY LIFE
IN DAILY LIFE
icon QUESTION OF DOSES
QUESTION OF DOSES
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AT THE DOCTOR’S
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At the laboratory
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At the museum
icon NUCLEAR ENERGY
NUCLEAR ENERGY
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RADIOACTIVE WASTE

The aim of this web site is to explain radioactivity and its applications to the general public.

Gray : unit of deposited energy

The unit dose of energy deposit by radiation is the gray (Gy) or milligray (mGy). One gray corresponds to an energy deposit of 1 joule per kilogram of matter. Unlike the sievert (the biological dose unit), the gray does not distinguish if the deposit occurs in inert or living matter. This unit is much used in radiation therapy (it measures the dose to the tumour), or to measure the exposure of an organ in an accident or a diagnosis. The gray now supplants an old unit, the rad : 1 gray = 100 rad)

Similar definition(s) :

Biological dose units : Sv, mSv

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