The SI unit of activity is the becquerel ( Bq ), equal to one reciprocal second.
2.
It is usually given in units of Bq / g, but another commonly used unit of activity is the curie ( Ci ) allowing the definition of specific activity in Ci / g.
3.
In the interests of standardising health-related units of measure used in the nuclear industry, the 12th CGPM ( 1964 ) accepted the continued use of the curie ( symbol Ci ) as a non-SI unit of activity for radionuclides; the becquerel, sievert and gray were adopted in later years.
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