Curie M.S. Curie née Skłodowska The curie (Ci) is the old unit of activity (A) and equal to the activity of 1 gram of 226Ra. The unit is named after the Polish-French physicist and chemist Maria Salomea Curie née Skłodowska (1867 - 1934). 1 Ci = 3.7×1010 Bq
