Radioactivity or the strength of radioactive source is measured in units of becquerel (Bq).
1 Bq = 1 event of radiation emission per second.
One becquerel is an extremely small amount of radioactivity. Commonly used multiples of the Bq unit are kBq (kilobecquerel), MBq (megabecquerel), and GBq (gigabecquerel).
1 kBq = 1000 Bq, 1 MBq = 1000 kBq, 1 GBq = 1000 MBq.
An old and still popular unit of measuring radioactivity is the curie (Ci).
1 Ci = 37 GBq = 37000 MBq.
One curie is a large amount of radioactivity. Commonly used subunits are mCi (millicurie), µCi (microcurie), nCi (nanocurie), and pCi (picocurie).
1 Ci = 1000 mCi; 1 mCi = 1000 µCi; 1 µCi = 1000 nCi; 1 nCi = 1000 pCi.
Another useful conversion formula is:
1 Bq = 27 pCi.
Becquerel (Bq) or Curie (Ci) is a measure of the rate (not energy) of radiation emission from a source.
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