Definitions for rontgenˈrɛnt gən, -dʒən, ˈrʌnt-
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Roentgen, Wilhelm Konrad Roentgen, Rontgen, Wilhelm Konrad Rontgen(noun)
German physicist who discovered x-rays and developed roentgenography (1845-1923)
The roentgen is a legacy unit of measurement for the exposure of X-rays and gamma rays up to several MeV. It is a measure of the ionization produced in air by X-rays or gamma radiation and it is used because air ionization can be measured directly. 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 X-rays may deposit anywhere from 0.01 to more than 0.04 gray in bone depending on the beam energy. This tissue-dependent conversion from kerma to absorbed dose is called the F-factor in radiotherapy contexts. The conversion depends on the ionizing energy of a reference medium, which is ambiguous in the latest NIST definition. Even where the reference medium is fully defined, the ionizing energy of the calibration and target mediums are often not precisely known.
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