Units of measurement
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Roentgen (R)
Curie (Ci)
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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.
Curie (Ci)
Curie (Ci) – unit of measurement for radioactivity, equal to 3.7 × 10¹⁰ decays per second (1 Ci = 3.7 × 10¹⁰ Bq).