Concerned or curious about radiation leaks? This small, portable, lightweight Geiger counter works with a free downloadable app for your iPhone to precisely measure beta and gamma rays from microsieverts per hour.
Geiger Counter - Radiation Sensor Board for Arduino and Raspberry Pi
Build Your Own Geiger Counter
Geiger Counter Kit - Radiation Sensor
Geiger Counter - SEN-11345 - SparkFun Electronics
A TOUCH SCREEN GEIGER COUNTER WITHOUT A GEIGER