This is a kind of neat project to do with the kids. If you don’t have a giger counter you can build a soup can radiation meter. This was an interesting article to read and if you would like to build this you can find video and instructions including a pdf on Survivalist daily.
http://www.survivalistdaily.com/how-to-make-a-kearny-fallout-meter/
RADStickerTM peel & stick, nuclear radiation exposure determining dosimeter
Radiation Detector SOEKS 01M – Geiger Counter – (English Language)
Radiation Alert INSPECTORXTREME Microprocessor-Based Ionizing Radiation Detector with Protective Boot
