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roentgen
noun
a basic unit of exposure to X-rays, gamma rays, or other ionizing radiation, equal to the amount of radiation that will produce an electric charge of 0.000258 coulomb per kilogram of dry air: abbrev. R
Roentgen,
Wilhelm Konrad 1845-1923; Ger. physicist: discoverer of X-rays
See roentgen in American Heritage Dictionary 4
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