[ RadSafe ] definition of Rad

Peter Bossew peter.bossew at jrc.it
Thu Oct 4 02:14:03 CDT 2007


'rad' is the old unit for the physical quantity 'absorbed dose', which 
is the energy deposited by ionizing radiation in unit mass, in SI units 
1 Gy = 1 J / kg.
1 rad = 0.01 Gy.


Kai Kaletsch wrote:
> Friends,
> According to the Wikipedia entry for 'Rad', it was defined from 1918 to 1953 as the unit of X-ray dose required to kill a mouse. 1) I never heard this definition before and 2) This seems like a very low dose for killing anything.
> This is somewhat before my time and I normally use SI units. Is the Wikipedia statement correct?
> Kai
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Peter Bossew 

European Commission (EC) 
Joint Research Centre (JRC) 
Institute for Environment and Sustainability (IES) 

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