The image of a large mushroom cloud looming over a city strikes fear into all of us. The mere mention of the word “radiation” brings some pretty horrific images to mind as well.But what are the real dangers of a nuclear event; not only a detonation, but an accident or radiological leak? Doctor Kenneth Peddicord, who has traveled to the former Soviet Union to help oversee the containment of nuclear material, tells us what we should be aware of, and how realistic some of our nightmares may be.