RE: Dosimeter Placement

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

Jim F. Herrold said the following:

> If other areas are more likely to receive exposures and you want to
>  relocate the badge, you must specifically request that type of badge. 
> This is what I have been told by Landauer, anyway. Is this how it is
> done by ICN and others? (Sandy?)

Jim is correct in his assumptions. While it is true that the primary 
whole body dosimeter, worn on the chest, is also used to provide the 
SDE and LDE, this assumes uniform exposure, across the entire whole 
body. If this is not the case, use of the single relocated dosimeter 
for determining the SDE and LDE may be in error, and could 
potentially result in regulatory action.

I have also observed individuals when calculating the Webster Dose 
Weighting Calculation, determining a weighted LDE and SDE from the 
two independent dosimeters. The Webster holds true ONLY for the EDE 
determined from the weighted DDE values. It can not be used for SDE 
or LDE. In actuality, the only true dose for the LDE has to come 
directly from the collar badge.

As noted, placement of a dosimeter, and, methods for determining the 
dose to meet regulatory requirements, as well as good radiation 
protection, does require some thought, and planning.

------------------
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 Homepage:
http://www.geocities.com/CapeCanaveral/1205

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