The 12th Conférence Générale des Poids et Mesures (CGPM),
considering that the curie has been used for a long time in many countries as unit of activity for radionuclides,
recognizing that in the Système International d'Unités (SI), the unit of this activity is the second to the power of minus one (s1),
accepts that the curie be still retained, outside SI, as unit of activity, with the value 3.7 ´ 1010 s1. The symbol for this unit is Ci.