Re: Webster formula Administrative Dose Assignments-Film Badges

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

At ICN, we provide this service to many clients (where the 
calculation of an Effective Dose Equivalent (EDE) is permitted by 
regulatory statutes.  We provide the following:

The Webster Dose Weighting calculation when 2 dosimeters are 
worn is:

EDE (Effective Dose Equivalent) = (1.5 X CH) + (0.04 X CL), where 
CH is the Deep Dose from the Whole Body Badge worn on the 
chest, UNDER the lead apron, and CL is the Deep Dose from the 
Whole Body Badge worn on the collar, outside the lead shield  

Note: The EDE is based on the deep dose equivalent, and is not 
appropriate for the shallow or eye dose equivalent.

example:

Chest DDE =  20 mrem    LDE = 20 mrem     SDE =   25 mrem  
Collar DDE = 250 mrem   LDE = 260 mrem   SDE = 275 mrem  

EDE = (1.5 X 20) + (0.04 X 250)
EDE = 30 + 10
EDE = 40 mrem

=========

IF the individual wears a SINGLE Badge, and wants the Webster 
Dose Weighting Factor applied, it MUST be a SINGLE COLLAR 
BADGE, and, the equations is CL X 0.3, so a Collar Badge with a 
DDE of 380 mrem would have an EDE = 114 mrem.

=========

For clients that request, when two dosimeters are worn and are 
used for the EDE calculation, a flag is provided on the report 
denoting that the chest badge (under the apron) exceeds the collar 
badge, or, the chest badge is less than the collar badge, but is 
within a specified % of the collar badge (which denotes that the 
individual most likely wore the two dosimeters at the wrong body 
location sometime during the wear frequency.

-----------------------
Sandy Perle
Technical Director
ICN Dosimetry Division
ICN Plaza
3300 Hyland Avenue
Costa Mesa, CA 92626
(800) 548-5100 x2306
(714) 668-3149 Fax

sperle@icnpharm.com or sandyfl@earthlink.net

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


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