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Thumbrules



     Radsafers,
        I am currently writing a procedure for use of the Ludlum model 
     239-1F Gas Flow Floor Monitor.  I was wondering if anyone out there 
     has thumbrules for monitoring speed versus probe distance from the 
     floor.  We have some very basic rules that we have developed and were 
     interested in checking our results with an independent source.  Any 
     information would be helpful.  Please respond directly to me.
     
     
     
     Chris Clawson
     Radiological Control Technician
     Sandia National Laboratories
     cdclaws@sandia.gov