Gamma Spectroscopy Data upload

I like your setup RHStation! Not the best looker with the PVC tape but looks like you are getting some mighty nice results! The pulse shape looks pretty perfect! That's the bit I'm currently struggling with by modifying my Mini Instruments 5.40. Whilst I get the amplitude to the sound card input mine is ringing like crazy so I have to make some kind of inverting amp and conditioner to smooth things out a bit.

I have a couple of scintillation probes. A Mini Instruments 44A which uses a sodium iodide crystal and some old alpha scintillation probe that I picked up from ebay. Both use photomultiplier tubes. I think the 44A is 32mm and the old alpha probe is about 25mm. I'm yet to get the alpha probe working/tested as the rate meter that came with the probe needs completely re-cap'ing before I can go further with it, and I inadvertently broke the aluminium window on the alpha probe by stabbing it with a screwdriver That's one of those rainy weekend projects when I have time. I also think I might have another alpha scintillation probe that is part of an old British Army Contamination Meter No 2 set (has 3 probes and the rate meter) but I haven't even looked at that yet. I picked it up from an antique place, brought it home and haven't touched it since! Another rainy day project!

Wow! That project looks fantastic! Very nice work.

I have some info on the 5-44A probe, but not a lot. It is an old probe from ~1985. I'm sort of starting to think from what you say that my probe isn't really made for spectroscopy?

This is the manual for the meter and probe. The details about the probe are on pages 14-17: https://ia600900.us.archive.org/23/items/MiniInstruments/Mini%20Instruments%20Mini%20Monitor%20%20900%20and%205.40%20series%20geiger%20counter%20manuals%20etc.pdf
This is the data sheet for the PMT in that probe: http://et-enterprises.com/images/data_sheets/9902B.pdf