Re: GM response to neutrons?

["Phil Hypes" <laradcon@HOTMAIL.COM>]

Based on the times I've played around with GM counters and neutron sources, 

I'd guess you were responding to the Am gammas.  Of course, there are AmBe 

sources that are shielded to prevent gamma exposure, so if that was the case 

you were either detecting higher energy gammas from the Am, or you were in 

fact detecting neutrons.  My guess would be gammas.  You really need H3 

tubes to get any kind of decent neutron response in gas filled detectors.



Phil Hypes

Los Alamos Radiation Consultants

laradcon@hotmail.com

505.920.9712











>From: Kai Kaletsch <eic@shaw.ca>

>Reply-To: Kai Kaletsch <eic@shaw.ca>

>To: RadSafe <radsafe@list.vanderbilt.edu>

>Subject: GM response to neutrons?

>Date: Wed, 29 Jan 2003 13:39:09 -0600

>

>Friends,

>

>could someone educate me about the response of GM tube based instruments to 

>neutrons?

>

>I remember playing with Am/Be neutron generators and using a GM based meter 

>to confirm that the source actually got back in the holder. (And the 

>regulators where OK with us only having GM based detectors on hand to 

>locate a possibly lost source. [They did want the operators to be badged 

>with neutron dosimeters.])

>

>So, the question is: Was the detector seeing some interaction of the 

>neutrons, or was it only seeing Am gamma?

>

>Thanks in advance,

>Kai

>http://www.eic.nu

>http://www.gammawatch.com/





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