Group: There's lots of info about Ionization Chambers and Counters in a book by that title by Rossi and Staub. Another good book on the same topic is Nuclear Radiation Detection by Price. Any library can borrow a copy for you if it's not on the shelf. Hope this helps, -- Wade mailto:hwade@triax.com H.Wade Patterson 1116 Linda Lane Lakeview OR 97630 ph 541 947-4974