Today we covered sources of background radiation, including rocks, the air, cosmic radiation and other radioactive everyday items such as smoke alarms (and old dinner plates! See the video above). Make sure you can list one or two of these items. We also revisited alpha and beta emissions, so use the slideshow on the link below to make sure youre up to speed with everything so far:
https://docs.google.com/present/edit?id=0ATFUvVu_WNI_ZGRxdDk3a3hfMGR0eHJ6Zmcz&hl=en&authkey=CJ-BrYcF
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