My #photomultipliertube test box I made some years ago. Basically a tin box with a lid, made light-tight with adhesive foam made for old SLR cameras. A BNC chassis socket with a bit of coax connects the outside electronics to the voltage divider/socket/PMT.
Shown are the PMT, a test #thallium doped #sodiumiodide #scintillation crystal and a spark gap containing ¹³⁷Cs to generate predictable pulse heights.

#radioactivity #gammaspectroscopy

Old video of mine showing a DIY alpha/beta #scintillationprobe. I built it with a #photomultipliertube, some ZnS(Ag) scintillator and some very thin "rad film" mylar. Especially the ¹⁴C source generates lots of counts 😈 #radioactivity #nuclearphysics

https://www.youtube.com/watch?v=xnpNb4Plt1Q

Sign of a #radiation nut: PMTs with voltage dividers lying around... #photomultipliertube #hamamatsu