Re: Webster method

["Sandy Perle" <sandyfl@ix.netcom.com>]

Those who currently utilize the Webster Calculation are Cath labs and 
a few other applications. The new ANSI Standard does address multiple 
dosimetry, however, the Webster basically centers around a dosimeter 
worn on the collar and another worn at the chest level under a lead 
apron. I don't have the current reference for it with me at the 
moment (I am currently sitting in my son's hospital room at the 
Medical City Center in Dallas) but I am sure that I could walk down 
to Radiology and find out ;)   For those who are not familiar with 
the Webster, the equation for two dosimeters is as follows:

(1.5*W) +(0.04*C)   where W is the chest badge under the lead apron 
and the C is the collar badge outside of the lead apron. I have seen 
many wear the chest badge incorrectly, i.e., outside the apron, 
incorrectly sway the two, and with the 1.5 factor, one can receive 
some very high EDE doses ...  higher than any of the single 
dosimeters.

------------------
Sandy Perle
Technical Director
ICN Dosimetry Division
Costa Mesa, CA 92626
Office: (800) 548-5100 x2306 
Fax:    (714) 668-3149
  
mailto:sandyfl@ix.netcom.com
mailto:sperle@icnpharm.com

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