تماشای ویدئو Messing around with photomultipliers از آی-ویدئو
Just how sensitive are these things.... insanely, it turns out...
Teardown of Gas analysers these came out of : http://www.youtube.com/watch?v=O21khzapt0Q
More info on PM tubes
http://www.youtube.com/watch?v=k4mKDFPiBj8