* direct alpha detection via wet film + process (slow, and day turnover physical processing) OR optical scintillation of filtered air, or
* stochastic gamma detection via a full spectrum and a formula to identify and divide out main peaks and daughter peaks of overlapping common radiometric decay (Uranium, Potassium, Thorium) to guesstimate the radon
I did this with radiacode and that library. I had chatgpt put together a quick little server that pushes from cdump/radiacode into MQTT for home assistant. I'd be happy to release it if there's interest.
For Radon detection options are
* direct alpha detection via wet film + process (slow, and day turnover physical processing) OR optical scintillation of filtered air, or
* stochastic gamma detection via a full spectrum and a formula to identify and divide out main peaks and daughter peaks of overlapping common radiometric decay (Uranium, Potassium, Thorium) to guesstimate the radon