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 aranet makes one too
https://aranet.com/en/home/products/aranet4_aranet_radiation
It connects to home assistant which is great.