Re: Dose Calib. Geometry Daily! HELP!

["Daren Perrero" <dmperrero@email.msn.com>]

Mobile settings for use of dose calibrators is a rather unique situation.  I
doubt you will find many individuals with a similar experience.  In Illinois
most mobile nuc med operations opt for having a calibrator at each location
they service.  Still, you are in an interesting position of being able to be
a significant data point for the manufacturer of your calibrator.  If you
are indeed performing a geometry check each day of use, you may be able to
justify to your regulatory agency that you merit an exemption from the
standard regulations which require such a check based on the reproducibility
of your data under the various transport conditions.  To the agency's
credit, they may insist that you still run a geometry check on a set
frequency (presumably something like quarterly, semi-annually or annually
depending on the justification you provide) to ensure there is indeed no
changes in the calibration chamber.  You may also want to look to the
manufacturer for some type of prototype testing of the calibration unit.
Shaker tables, and short distance drop tests to simulate typical road
conditions (ignoring Illinois tremendous pot hole situation) could go a long
way in substantiating your request for the relief from the regulation with
some type of caveat that a full test would be done in the event an accuracy,
reproducibility or other test indicator show a significant (>10%) variance.

Of course, just my opinion.

Daren Perrero
dmperrero@email.msn.com
Specialist in Radiation Safety
I'm with the government, I'm here to help you.....

-----Original Message-----
From: AHC Inc NM <AHCIncNM@aol.com>
To: Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>
Date: Thursday, March 05, 1998 9:47 PM
Subject: Dose Calib. Geometry Daily! HELP!


>Subject:     Dose Calib. Geometry Daily!  HELP!
>Sent:        3/3/98 8:29 PM
>To:          radsafe@romulus.ehs.uiuc.edu
>From:        ahcincnm@aol.com
>
>Does anyone have experience using a Dose Calibrator in a mobile setting
>(van) and supporting info. for ruuning a Geometric Variation less than
>daily?
>
>We run the somewhat time consuming geometry test everyday to meet our
>license and State regulatory body requirements! Consider also, accuracy
>with 3 sources, constancy and linearity are also a part of morning QC.
>
>Is anyone familiar with any existing documents or papers that may be
>helpful in an amendment?
>
>G Thomas Preston, CNMT
>AHC, Inc.
>800 999 9154 x6