Re: Regulatory Use of EDE vs ED

["Sandy Perle" <sandyfl@EARTHLINK.NET>]

Chris,



As you've noticed, there is no consistency in ED or EDE. 



We do provide many facilities with EDE calculations, based on the 

better known, Webster methodology (both for single and for 2 badges 

worn), and, the Niklasson methodology, which does provide for a 

higher dose determination, compared to the Webster. We also provide 

one facility an EDE based on ANSI N13.41-1997 methodology, which does 

take into account specific organ dose weighting. 



With respect to state accepted EDE calculations, there is no 

consistency. Some allow all wearers to use it, some only the MD, some 

only the technologists. I doubt there will ever be a single accepted 

rule on the use of EDE.



Recently, the NRC put out a statement that does allow licensees to 

take credit for EDE if the state regulated program allows the use of 

EDE calculations. I can out my hand on it if necessary. I am also 

aware that there is one nuclear power plant, who has submitted a 

request to the NRC, to allow use of EDE calculations, based on a  

front and rear TLD being worn (for specific jobs where there is non-

uniform geometry). The NRC has given preliminary favourable comments 

back to the utility.



I am not aware of FDA using the ED model. I am sure that perhaps 

someone else will jump in and provide their feedback.

-------------------------------------------------

Sandy Perle

Director, Technical

ICN Worldwide Dosimetry Service

ICN Plaza, 3300 Hyland Avenue

Costa Mesa, CA 92626



Tel:(714) 545-0100 / (800) 548-5100  Extension 2306

Fax:(714) 668-3149



E-Mail: sandyfl@earthlink.net

E-Mail: sperle@icnpharm.com



Personal Website: http://sandy-travels.com

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



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