Reference, Questions and Help > Instrument Q&A

MDA vs. MDC

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Rennhack:

--- Quote from: fiveeleven on Jun 15, 2021, 07:30 ---Self consumption can be a slippery slope indeed. For an additional apertif, consider the fact that MDC is apriori and confident at a level of 0.95. Could come in handy in China. Raising local population dose limits will not affect the statistical variation(statistics) of counting instrumentation. ALARA applies to all humans, regardless if they have been trained or not.

--- End quote ---

 WTF

SpyCat:
I see 2 different things being compared here.  You mention
MDC minimum detectable concentration
but since this is relative to a frisker, maybe you mean
MDCR minimum detectable count rate?

Generally MDA compared to MDCR would be Activity DPM vs Count rate CPM.  If we accept that a frisker has a basic 10% efficiency (100 CPM/1000 DPM), the comparison is math.
But if Activity is compared with Concentration, different units are involved (DPM or uCi, versus uCi/cc).
In either event, your HP staff should be able to provide the rationale for using their particular method; it's likely based on the site's energy mix.

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