Radioactive Isotopes

A Geiger counter is used to detect emission of alpha particles, beta particles, and gamma rays. The teacher experiments to find out which materials block each of these forms of radiation. The camera is focused on the measuring instrument and the teacher's hands the entire time, making this video not very visually attractive. However, it is interesting enough to be worthwhile. If you do not have your own Geiger counter, use this video to demonstrate the strength of these forms of nuclear radiation.