Mda Diffrences question

Submitted by Anonymous on Wed, 2011-08-17 20:13

Why the discrepancy in mda levels in your testing even on the same items? it seems to be evolving is it set on a test by test basis .if u could explain why this is the best u can .thanks for reply brawm

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The MDA is different for each sample and each isotope

Submitted by bandstra on Sat, 2011-08-20 21:38.

The Minimum Detectable Activity (MDA) is the statistical limit for a test, and it is different for each sample and isotope. It is calculated from the number of background gamma-rays in the region where each gamma-ray line is expected. The number of background gamma-rays detected in each region of the spectrum is affected by many factors, especially the time over which the sample was counted, the efficiency of the detector in that region, the presence of nearby background lines, and the size of the sample. This is why the MDA can change from sample to sample and isotope to isotope. We also have a more technical definition on our MDA explanation page. Mark [BRAWM Team Member]