FTLAB FSG-001 is a $30 Geiger Counter / Radiation Detector for Android & iOS Smartphones - CNX Software
Smart Geiger Pro Geiger Counter for Smartphone with App | tradekorea
Geiger counter for Arduino and smartphones versus uranium glass
Smartphone Geiger Radiation Detector Counter Gamma X-Ray for iOS or Android! | eBay
Smart Geiger Counter Nuclear Radiation Dosimeter Gamma X-ray Personal Detector Counter Tester Sensor for Smartphone Apple iPhone 4S and Above/Android 4.2 and Above iOS with App: Amazon.com: Industrial & Scientific