Suppose you have three unbreakable glass vials on a table in front of you, six inches away. Each vial is permanently and safely sealed. The first vial contains a powerful alpha emitter, the second contains a power beta emitter, and the third contains a gamma emitter. Each vial is equally radioactive; that is, each is producing the same number of Bq of its respective radiation. Which of these vials is the most dangerous to you? Why?