Home Contents Glossary Search Help

Minimum detectable activity
Previous Up


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.


The University of Liverpool
1999, 2000 The University of Liverpool, Department of Physics

EPSRCProject funded by The Engineering and Physical Sciences Research Council

Materials Teaching Educational ResourcesWebsite developed and maintained by the MATTER Project