Becquerel (Bq)

[Rennhack]

The Becquerel is a unit used to measure a radioactivity. One Becquerel is that quantity of a radioactive material that will have 1 transformation in one second. Often radioactivity is expressed in larger units like: thousands (kBq), millions (MBq) or even billions (GBq) of a Becquerel. As a result of having one Becquerel being equal to one transformation per second, there are 3.7 x 1010 Bq in one curie.

[Rennhack]

The unit of radioactive decay equal to 1 disintegration per second. 37 billion (3.7 x 1010) becquerels = 1 curie (Ci).

[Rennhack]

http://www.epa.gov/radiation/understand/curies.htm

[SloGlo]

there are 3.7 x 1010 Bq in one curie.

3.7e10 which is nuclear shorthand for 3.7x10¹⁰