Units of Radioactivity





Units of radioactivity

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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