ROENTGEN
Roentgen
The roentgen is a legacy unit of measurement for the kerma of X-rays and gamma rays up to 3 MeV. The unit is still used in the United States Navy nuclear propulsion program. It is named after the German physicist Wilhelm Röntgen, who discovered X-rays. Originating in 1908, this unit has been redefined and renamed over the years. It was last defined by the US National Institute of Standards and Technology in 1998 as 2.58×10−4 C/kg, with a recommendation that the definition be given in every document where the roentgen is used. One roentgen of air kerma deposits 0.00877 gray of absorbed dose in dry air, or 0.0096 gray in soft tissue. One roentgen of ...The above text is a snippet from Wikipedia: Roentgen (unit)
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