RE: Badge Readings Part 2

[Peter.Vernig@MED.VA.GOV]

Sandy and group,



A thought I had after sending was that maybe NVLAP program could assist in

evaluation of the discrepancy.  Would they be likely to do that or are they

strictly a wrist slapping inspection agency.



BTW since regulations do not allow licensees to get dosimetry from a vendor

that is not NVLAP accredited shouldn't they drop the V = voluntary from

their name?  I guess the program is bigger than dosimetry however.



Any opinions in this e-mail are solely those of the author, and are not

represented as those of the VA Eastern Colorado HCS, the Dept. of Veterans

Affairs, or the US Government.



Peter G. Vernig, Radiation Safety Officer, VA Eastern Colorado Health Care

System, 1055 Clermont St. Denver, CO 80220, peter.vernig@med.va.gov, Phone=

303.399.8020 x2447; Fax = 303.393.5026, alternate fax, 303.393.5248



"...whatever is true, whatever is noble, whatever is lovely, whatever is

admirable, if anything is found to be excellent or praiseworthy, let your

mind dwell on these things."



Paul of Tarsus





-----Original Message-----

From: Sandy Perle [mailto:sandyfl@earthlink.net]

Sent: Thursday, July 22, 2004 10:36 AM

To: Vernig, Peter G.; radsafe@list.vanderbilt.edu

Subject: RE: Badge Readings Part 2





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/

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