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Radioactivity is a random event which can only be adequately

described using statistics

Activity:

total number of disintegrations (decays) per unit time - SI

unit is the Becquerel (Bq) - nuclear transformation per second –

(Curie (Ci) activity of 1 gr of Ra-226)

Activity

A(t) =

l

N(t)

where N(t) is the number of radioactive nuclei at time t

Decay constant

l

characteristic parameter that describes how

fast a particular nucleus transforms (probability of disintegration per

unit time)

Activity

1 Ci = 37 x 10

9

Bq = 37 GBq