Curie (unit)


from Wikipedia, the free encyclopedia
Physical unit
Unit name curie
Unit symbol
Physical quantity (s) activity
Formula symbol
dimension
In SI units
Named after Marie and Pierre Curie
Derived from Activity of radium -226
See also: Becquerel

Curie is the obsolete unit of activity of a radioactive substance with the symbol Ci; it was used temporarily until 1985, when it was replaced by the SI unit Becquerel . Today it is only used in materials testing. 1 curie was originally defined as the activity of 1 g of radium -226, and later set to the approximately same value of 3.7 · 10 10  Becquerel (= 37 GBq).

The unit was named after Marie and Pierre Curie who, together with Antoine Henri Becquerel, received the Nobel Prize for the discovery of radioactivity in 1903 .