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Boise State University
Boise State: Nuclear Chemistry and Radiation: Types of Radioactive Decay
This article with embedded videos provides information about three main types of radioactive decay: alpha, beta, and gamma.
PBS
Pbs: People & Discoveries: Ernest Rutherford
A lovely biographical piece about Ernest Rutherford. A number of personal notes, along with extensive information about the physics work he did. Nice quote at the end.