5.2 Radioactivity Is a Natural Phenomenon

Radiation Occurs Naturally

A discussion of the various origins of radioactivity. Attention is given to how radiation is measured in both rads and rems. Duration: 9:15.

Field Trip to an Underground Aquifer

Kai takes a field trip to an underground aquifer where he learns about an application of radioactive tracers. A humorous, but informative presentation. Duration: 4:17.