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Minimum detectable activity
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The minimum detectable activity (MDA) is the minimum activity we can be confident of detecting in a measurement to a specified confidence level.

It is related to the detection limit LD
where  t is the counting time
Pg is the branching ratio, the fraction of all decays feeding the g emission detected
e is the detection efficiency

For example: see right.

You can edit the branching ratio for a different case - just click on the number to enter a new value.

 

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