Detecting radiation all around you is not that hard as long as you have a decent Geiger counter. Not all Geiger counters are cheap or sophisticated enough to work with your smartphone. The Radium happens to be an affordable Geiger counter with a developer friendly design. It uses Bluetooth for data transmission. It has a sensitive pancake tube to detect Alpha, Gamma, and Beta radiation.
The Radium is compatible with iOS, Android, and Windows phone devices. It comes with two caps to filter Alpha or both Alpha and Beta radiation. The device has a 1.3″ bright OLED display and 3 capacitive buttons. You can charge it through its MicroUSB port. Like what you see? The product is on Kickstarter.