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[GEORGE CICOTTE <GEORGE_CICOTTE@health.ohio.gov>]

     Let's not forget who to thank on this one.  It isn't just HPs, but the 
     people who work at Kodak, Polaroid, etc.  Most of the 
     order-of-magnitude reduction in dental x-ray dose is from improvements 
     in film sensitivity.  If I recall correctly, a full panoramic used to 
     entail an exposure of about 4 mSv, vs ~.01 mSv inferred for the single 
     intra-oral Dr. Gibbs notes below.  Someone more schooled in medical HP 
     please correct me, if necessary, on this historical trivia.
     
     V/R
     george_cicotte@health.ohio.gov
     
     With respect to Dr. Gibbs' post:
     
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      . . . ."A dental x-ray is equal to a day in the sun" has turned out 
     to be a remarkably accurate projection--even if for all the wrong 
     reasons. . . . The effective dose from a single intraoral film, done 
     with state-of-the-art technology in 1997, is approximately equal to 
     one day's natural background--using the NCRP estimate of 3 mSv/y. . .