[ RadSafe ] GM vs ion chamber for dose measurement

Robert Atkinson robert.atkinson at genetix.com
Fri Mar 23 03:13:25 CDT 2007

There is one other issue to consider, what exact model and type of GM
probe/meter is being mandated. There are energy compensated GM tubes
(fitted with filters to attenuate the lower energy gammas that cause the
GM tube to over-respond). While some are better than others it is
possible to get an accurate dose response from a properly designed and
calibrated meter with the matching probe. Many use fixed tubes so that a
non compensated tube cannot be used in error.


-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On
Behalf Of Sandy Perle
Sent: 22 March 2007 18:10
To: 'Baumbaugh, Joel SPAWAR'; radsafe at radlab.nl
Subject: RE: [ RadSafe ] GM vs ion chamber for dose measurement


I am in 100% agreement with you and your comments. I assume the
has their reasons for not simply utilizing an ion chamber (you can reply



Sandy Perle 
Senior Vice President, Technical Operations 
Global Dosimetry Solutions, Inc. 
2652 McGaw Avenue
Irvine, CA 92614
Tel: (949) 296-2306 / (888) 437-1714 Extension 2306 
Tel: (949) 419-1000 Extension 2306
Fax:(949) 296-1144
Global Dosimetry Website: http://www.dosimetry.com/ 
Personal Website: http://sandy-travels.com/ 

-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On
Of Baumbaugh, Joel SPAWAR
Sent: Thursday, March 22, 2007 10:20 AM
To: radsafe at radlab.nl
Subject: [ RadSafe ] GM vs ion chamber for dose measurement

Yes, I know this isn't Friday, but I have a philosophical question for
the group.

So, in conclusion: Am I wrong to be questioning what's going on here? Is
the use of GM's for quantitative/qualitative measurement of gamma/x-ray
dose now an accepted protocol?  

Thanks (ahead of time) for your thoughts.

Joel Baumbaugh

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