I am convinced that local release EMP devices are BS - the fantasy of paranoinacs and survivalists, in the worst sense of that term.
However, from some documents which I have obtained in litigation and cannot provide to you, I have learned that the detonation of a small nuclear (nucular, in the pronunciation of our fearlful leader) will result in third degree burns to exposed skin at a distance of 64 MILES.
I was born in '57. I went to a private schoolin Abilene, Texas with the kids of a bunch of SAC pilots from Dyess AFB. Their dads said, 'In case of air raid, get down in a comfortable possition, put your head between your legs, and kiss your ass goodbye.'
I am not frieghtened by the 64 mile stat - it just gives me one less thing to worry about. I'll be dead.