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Soviet surplus БДЭГ-01Р // BDEG-01R scintillation probe I bought this on a bit of an impulse buy (seller accepted a very low eBay offer). This has a 63x63mm NaI(Tl) crystal in it paired with a ФЭУ-82 (FEU-82) photomultiplier tube. Need to get some new hardware to finish this up before I will be ready to try doing any gamma spectrometry testing with this. The PMT has pretty underwhelming specs of "≤13%" resolution so I am not expecting anything too impressive from it besides the count rate out of a crystal that large. May have to consider swapping it out for a better photomultiplier tube in the future...