Becquerel

The becquerel (symbol: Bq), equivalent to s-1, is the SI derived unit of radioactivity (A). 1 Bq is defined as the number of times a nucleus decays every second.

Formula
where  is the number of radioactive atoms in a radioactive sample, which has no unit, and  is the decay constant measuring how fast radioactive decay occurs over time, which depends on the nature of the radioactive sample, particularly the constituent isotopes.

Half-life
The half-life is the time required for half of the radioactive atoms of a sample to decay. It can be found by the simple formula.

Petabecquerel
A petabecquerel corresponds to 1015 times a Bq. The unit is named in honor of French physicists Henri Becquerel.

Related pages
Curie
Sievert
Atomic orbital
Atomic physics
Particle physics
Nuclear physics
Quantum mechanics
Classical mechanics
Nuclear binding energy
Mass-energy equivalence

References

Category:SI derived units
Category:Units of frequency
Category:Units of radioactivity