You are good I'll check that reference out today! I did a EBay search of scintillation crystal this morning and was surprised at prices and sold crystals. I have three heads and parts for three more. I have a lot of PMT's (6 x 37 = 222) of various manufactures RCA, Amperex and S.R.C. Laboratories. Yes PMT's are still very much in use among some other vacuum tubes. With PMT's they use very high voltages that IC chips will never handle (shouldn't say never, but I did). some of the RCA PMT's have the RCA developmental sticker that was used to by RCA research facility in Pennsylvania. All of the PMT's have serial numbers my experience tells me s/n's have significance when research/development, performance and/or cost factors have to be tracked/recorded. Yes these were used in medical field, made initially by a company called Ohio Nuclear, they developed some of the first Gama cameras and medical CT scanners. I found these sometime ago and have made reference to finding this stuff in a few post before.
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