There are three units (Becquerel, curie and Rutherford) of radioactivity. Curie (Ci) is defined as that quantity of any radioactive substance which gives $3.7 \times 10^{10}s^{-1}$ disintegration (dps). Rutherford (rd) is defined as the amount of radioactive substance which gives $10^6$ disintegrations $s^{-1}$ (dps).

$\text{1 curie} = 3.7 \times 10^4$ Rutherford

$\text{Ci} = 3.7 \times 10^4 \text{rd}$

In SI system, the unit of radioactivity is Becquerel (Bq)

1 Bq = 1 dps = 37 Gbq

$[\text{G = giga}; 1 G = 10^9]$

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