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Article | REF: SL6160 V1

Protection against the dangers of ionizing radiation

Authors: Alain BIAU, Jean-Pierre VIDAL

Publication date: June 10, 2009, Review date: September 1, 2015

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3. Physical and dosimetric quantities

3.1 Radioactive activity

The activity of a radioactive source is defined by the number of radioactive transformations (disintegrations) per unit of time and obeys the following law:

A=dN/dt=    N

with :

N
 : 
number of atoms at time t,
λ
 : 
(s –1 ) radioactive...
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Physical and dosimetric quantities
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