Units of measurement
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Roentgen (R)
Rad
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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.
Rad
Rad (rad) – unit of measurement for absorbed dose of ionizing radiation in the older system, equal to 0.01 Gray (1 rad = 0.01 Gy).