[ RadSafe ] cesium 137 check source rate

Lemieux, Bryan P blemieux at uthsc.edu
Thu Aug 19 08:56:09 CDT 2010

Of interest is that Ludlum is also selling "inserts" that you can use with their pancake probes to turn them into energy compensated probes.  They are easily inserted or removed so that you can switch between energy compensated and "open window".  They have two different types, one for dose equivalent and one for exposure rate.  

Bryan Lemieux, M.S., CHP
Radiation Safety Officer
University of Tennessee Health Science Center
3 N Dunlap St. S110 Van Vleet Bldg
Memphis, TN 38163
Phone:  901-448-6114
Fax:      901-448-7774

Please note my new email address: blemieux at uthsc.edu

-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu [mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Geo>K0FF
Sent: Thursday, August 19, 2010 8:50 AM
To: The International Radiation Protection (Health Physics) MailingList
Subject: Re: [ RadSafe ] cesium 137 check source rate

John Dixon said:
"a count rate meter such as a Geiger Counter CAN measure a dose rate if 
there is an applicable correction/calibration factor associated with it - 
i.e. XXX counts per minute per mr/hr for an applicable isotope- something 
like that. "

Since we are often called upon to measure dose rate of an unknown isotope, 
or a mixture of isotopes, the easy way out is to use an energy compensated 
probe (i.e. Ludlum Model 44-38), with the corresponding scale for mR/H (i.e. 
202-084 meter face). Accuracy still depends on geometry, in other words the 
field must be larger than the probe.


George Dowell
New London Nucleonics Lab 

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