I'm doing it... progress

[vjoco]

Board ordered at pcbway, resized for 2 layers

Part 1, 30V power supply, approx 1h work

• soldering component
• supply 5V on VSYS
• get 30 V at the output, nice

[NuclearPhoenixx]

Neat, good luck for the rest of the soldering!

[vjoco]

It's done.
I was using a GSO crystal from ebay, 6x4x20mm. The number of ph/MeV is 20% of a NaI so I boost the amplification stage. I had to modify the discriminator because the offset increased.

This is the first pulse I got:

I could find 60% KCl at a supermarket, this is a photo of the setup:

And this is the first spectra (10 minutes aquisition):

Very nice project!

I'm leaving now for a 10h acquisition. K should be there :)

[NuclearPhoenixx]

Hey there, glad you're making progress! Pulses might be a bit too fast if you're encountering any problems. Looks like you should either turn up the gain a little bit or tune down the threshold. It shouldn't cut off that quickly, happy hacking!

[vjoco]

Thanks, pulses are fast probably because iI use a GSO-Ce. I had to boost the gain and make the SH circuit faster.

[vjoco]

In the end everything works very nice, I share some photos/results: