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Activity Equation

Defines the activity

A

of a radioactive sample as

A = λN

, where

λ

is the decay constant and

N

is the number of radioactive nuclei.

📜

The statement of the theorem

Define the activity

A

of a radioactive sample as the rate of decay,

A = \left| \frac{dN}{dt} \right|

. If

\lambda

is the decay constant and

N

is the number of radioactive nuclei, the activity is defined by the relation:

A = \lambda N

Source: Wikipedia