physically significant activity

[Dave Abbott <abbott@washops.llnl.gov>]

Just received my latest issue of HPS Newsletter yesterday.  Under the ABHP
example exam question section Ken Skrable puts together, a new (to me at
least) measurement term, PSA, is mentioned.  Can anyone point me in the
right direction where I can find a good explanation of this term, and why
we need something on top decision levels, MDAs, MDCs etc.?
David Abbott
Lawrence Livermore National Laboratory
abbott@washops.llnl.gov
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