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-----Ursprüngliche
Nachricht----- 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? ----------------------------------------------------------------- Kai, I guess, that you recorded charged particles, which
were knocked out by the neutrons from the GM tube or the instrument. Additionally
the gammas from Am might have an effect, though they have a very low energy and
therefore a very low counting efficiency. Since Am/Be sources are not in the
low-level range (!) these effects will probably be sufficient to determine
whether the source is in its shielding or not - a simple yes/no decision. To
determine your dose from the neutrons of course you have to use a specific neutron
dosimeter. Best regards, Franz |