Now that's a toy you don't stumble across very often! Not sure what I'd do with it, but others may have a use: https://www.radiacode.com/
Radiacode – Portable Radiation Detector, Dosimeter & Spectrometer

Radiacode is a fast, portable radiation detector, dosimeter, and spectrometer with real-time analysis. 20× faster than Geiger counters, it identifies isotopes, tests food for contamination, and supports research and safety.

@cstross

I think a good use case would be collecting 1940s uranium coloured glass. Looks pretty. Clicks hard. Yoink I say.

@ai6yr

@tempusfelix vaseline glass tends only to be mildly clicky. It's much easier to find in a thrift store with a UV flashlight: its glow is very bright