Robert,
Americanium 241 is a strong alpha emitter and a weak gamma emitter. The glass in
your tubes will block the alphas.  Most Geiger counters have tube with an alpha
window. Its likely the Geiger counter could read both the alpha and the gamma
radiation where your tubes could only read the gammas.
Ron Fleshman
 


--- On Thu, 3/5/09, robertatairstream <robert@...> wrote:











That is excellent feedback Hannes, as I was very disappointed that I
didn't get the same level reaction in the tube detector as I did with a Geiger
counter. As the increase is only just noticeable.



Cheers



Robert






























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