To even try the items, you would have to form the scintillator to the tube's cylindrical face (grind, machine, tec.) Then, you would have to polish to aglass like finish and then optically silicone couple the items. (lotta' trouble)
Finally, the flat faced PMTs have a photocathode depositied on the front face of known size and area. You don't have that on the 931A or its ilk.
Richard Hull
Created on Thursday, May 03, 2001 2:27 PM EDT by Richard Hull