From: nobody@nospam.not   
      
   Morris Dovey  wrote in news:js0eu2$e0p$1   
   @speranza.aioe.org:   
      
   > I'm thinking that I want to establish an average background count as   
   > part of the start-up procedure, then trigger an automatic shutdown if   
   > the unshielded count exceeds that average by some factor (x10?) or by a   
   > lesser factor (x5?) through a 30-second period during the test.   
      
   "Counts" have a statistical fluctuation.  If you have a level of counts 10-   
   fold over average background (averaged over a few seconds, up to a minute),   
   it is really a very minimal amount.  To exclude false positive shutdowns,   
   I'd start with at least 100-fold over background, averaged over a minute.   
      
   --   
   Best regards   
   Han   
   email address is invalid   
      
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