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.
In this Nov. 10, 2000 photo, the control room with its damaged machinery, is seen inside reactor No. 4 in the Chernobyl nuclear power plant. Geiger counters registered about 80,000 microroentgens an hour, 16,000 times the safe limit. (AP Photo/ Efrem Lukatsky)