You can pick a great kit from MightyOhm that has the tube and supporting electronics to power it. It outputs data on a serial connection so it's easy to read f

You can pick a great kit from MightyOhm that has the tube and supporting electronics to power it. It outputs data on a serial connection so it's easy to read from an Arduino. Check it out here: https://www.adafruit.com/products/483 https://www.adafruit.com/products/483 It's best for detecting gamma rays and really can't detect alpha or beta rays, so for example a smoke detector's americurium source won't really set it off but old uranium glaze cookware will drive it crazy. Not sure about x-rays but I bet it would catch them since they're pretty high energy and penetrating.