RE: Badge Readings Part 2

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

On 22 Jul 2004 at 7:24, Vernig, Peter G. wrote:



> How about a test?  Get an X-ray dosimeter and measure an EDE for an

> x-ray unit.  Estimate the absorbed dose and irradiate one each Luxel ,

> GDS film in the same exposure. 



Good idea. However, one must go further. As mentioned in a previous 

reply, one must be able to not only test a perpendicular exposure, on 

a standard phantom, but must be able to test the dosimeter in the 

"real world" geometry, as to how the badge is actually worn. Once can 

create an algorithm to handle the ANSI N13.11 testing OK, but if the 

angularity geometry is not taken into account, then the actual dose 

assessment can lead to a significant over-reporting of dose. The 

algorithm and it's very components are the major sources of 

measurement of uncertainty, which BTW, is required to be documented 

by NVLAP as part of ISO 17025 requirements. 



One should understand the uncertainty of the "system" used.



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

Sandy Perle

Sr. Vice President, Technical Operations

Global Dosimetry Solutions, Inc.

3300 Hyland Avenue

Costa Mesa, CA 92626



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

Fax:(714) 668-3149



E-Mail: sperle@dosimetry.com

E-Mail: sandyfl@earthlink.net



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

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



************************************************************************

You are currently subscribed to the Radsafe mailing list. To

unsubscribe, send an e-mail to Majordomo@list.vanderbilt.edu  Put the

text "unsubscribe radsafe" (no quote marks) in the body of the e-mail,

with no subject line. You can view the Radsafe archives at

http://www.vanderbilt.edu/radsafe/