Re: lead apron thicknesses

["Sandy Perle" <sandyfl@earthlink.net>]

> My proposal is a double badge system. Use an apron thin enough to provide a
> reading just over minimum for the busiest month. Using 122, this should yield
> an effective dose (E) less than 1 mSv/y

The original question on the MedPhysics Listserver was with respect to the 
Webster Dose Weighting Factor EDE calculation. The question was, if the 
EDE result from the Webster Dose Calculation was based on a lead apron of 
0.50 mm, and that lead thickness was reduced, would not the Webster Dose 
Calculation basis be affected. The answer is YES. The Webster calculation  is 
based on the double badge system, one on the collar (outside of a shield, and 
the 2nd, under a lead apron). There is also a Webster dose calculation for a 
single badge, but THAT badge MUST be worn on the collar, and not be 
shielded, so the single badge is not part of the issue at all. Therefore, the above 
approach is going to result in a higher dose to the individsual solely by reducing 
the lead filtration in the apron.

------------------
Sandy Perle
Technical Director
ICN Dosimetry Division
Costa Mesa, CA 92626
Office: (800) 548-5100 x2306 
Fax:    (714) 668-3111
  
sandyfl@earthlink.net
sperle@icnpharm.com

ICN Dosimetry Website:
http://www.dosimetry.com

Personal Website:
http://www.geocities.com/CapeCanaveral/1205

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