GMC Geiger counters have a usb port, which lets you upload real time data: https://www.gmcmap.com/
I'd guess you still need to maintain them and confirm their accuracy. Tuning a Geiger counter seems more niche then tuning a humidity sensor.
I don’t know… we have radioactive elements with a very long half-life, which I assume would be great for calibration: somewhat safe and low activity, so good match for atmospheric concentrations of common radionuclides
A single sensor is cheap. Thousands and tens of thousands of installations with a dozen sensors, not so much.
If you already have the facility why not record everything? Or is a good radiation detector a $$$$ investment?