RE: MDA vs. Critical level for DOE Free Release surveys

["MacLellan, Jay" <jay.maclellan@pnl.gov>]

In reply to Tom.Goff questions about MDA and DL, he is right about

needing an MDA that is less than the limit.  You want to be at least 95%

sure that you won't miss contamination that is above the limit.  If the

decision level is equal to the limit you have a 50% chance of missing

it. 



Jay MacLellan, CHP 



PS:  Since I know what I'm talking about on this I'll leave the

credentials with my signature on this one.

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