Radon is a radioactive gas that is naturally emitted from the earth's surface and it is basically inert. It's an odorless, colorless, and invisible
EcoSense RD200 RadonEye Home Radon Detector Fast & Accurate Real-Time Monitoring OLED Display Easy Setup with Free App Bluetooth
DIY Radon Detector
Radon Detector
How to Build a Home-Brew Radon Detector - IEEE Spectrum
RD200M : High-performance radon sensor - Radon FTLab
Rad Elec Inc.
How to Build a Home-Brew Radon Detector - IEEE Spectrum
Radon Calibration Facility
Radon Detector Circuit