Units of measurement
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Calculations
Roentgen (R)
Gray (Gy)
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Information
Roentgen (R)
Röntgen (R) – unit of measurement for ionizing radiation dose, widely used before the introduction of the SI system but still used in some countries.
Gray (Gy)
Gray (Gy) – unit of measurement for absorbed dose of ionizing radiation, equal to 1 joule per kilogram (1 Gy = 1 J/kg).