Curie Ci
About the Curie
The curie, exactly 3.7 × 10¹⁰ decays per second, was based on the activity of one gram of radium-226. It is named after Marie and Pierre Curie. The SI replaced it with the becquerel, but the curie is still common in the United States.
Related Units
Roentgen
R2.58 × 10⁻⁴ C/kg (exact)
The roentgen measures exposure to X-rays and gamma rays by the ionisation they produce in air, exactly 2.58 × 10⁻⁴...
Becquerel
Bq1 Bq = 1 s⁻¹ (one decay per second)
The becquerel is an activity of one radioactive decay per second, named after Henri Becquerel, who discovered...
Gray
Gy1 Gy = 1 J/kg = 1 m²·s⁻²
The gray measures absorbed dose of ionising radiation, one joule of energy deposited per kilogram of matter. It is...
Sievert
Sv1 Sv = 1 J/kg = 1 m²·s⁻²
The sievert measures the biological effect of radiation, weighting the absorbed dose by radiation type and tissue...