Suppose that the dial on your watch happens to glow in the dark. What radioactive material(s) are used to make the dial glow, and what sort of radiation do they emit? Who is Dr. Willard Libby, and...

Suppose that the dial on your watch happens to glow in the dark. What radioactive material(s) are used to make the dial glow, and what sort of radiation do they emit?

Who is Dr. Willard Libby, and what important contribution did he make to the eld of nuclear science and engineering?