Scionix in The Netherlands has taken advantage of the recent development of miniature mesh-type dynode photomultiplier tubes to construct small-diameter scintillation probes. Scionix’s miniature probes incorporate one of those PMTs, a NaI(Tl) scintillation crystal, and a built-in dynode voltage divider. Connection to the probe is made through a miniature high-voltage locking coaxial connector. Finding a mating connector is the main problem faced by enthusiasts who find these probes in the surplus market.
After much searching, I found out that the mating connector is a Lemo FFA.00.250.NTAC29. I also found that Hovac Inc. makes a patch cable with this Lemo connector on one end and a BNC on the other. The Hovac part number is 69200197 (Cable CCT 150-BL RG 316/U Teflon 1,50 BNC / Lemo FFA.00.250.NTAC29 ). I bought two cables from them. They are made on a pre-order basis, so it took quite a while for them to arrive.