G'day Robert, robertatairstream wrote: > 5) Holding the alpha particle source close increases these pulses and turning it away decreases. this sounds a little strange to me, since alphas won't go thru the glass of the tube. Most likely your source also produces a good amount of gammas and that is what you see. Cheers, Hannes. -- +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+ | Captain's Universe http://www.captain.at | | Muon Detector http://www.cosmicrays.org | | Artemia Homepage http://www.captain.at/artemia/ | | Fairy Shrimps http://www.captain.at/fairy-shrimp.php | | JupiterRadio Astro http://www.jupiterradio.com | | Earth Magnetometer http://www.magnetometer.org | | Mars Base dot Net http://www.marsbase.net | | Bryophyllum Plants http://www.bryophyllum.com | | Fossils in Austria http://www.fossils.captain.at | +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+