On Mon, 09 Jun 2014 19:31:37 +0100, dennis@home wrote:

And valves were much better at standing up to the electromagnetic

pulse released by a nuclear explosion...

Thats why the soviets used then in their aircraft!..

I think that's mainly a puff of chaff, aircraft don't need to be
particularly rad hard as they get blown over and wiped by blast
long
before the electronics pop.

Blast radius a few miles..

Depends on the weapon yield and burst height. The megaton weapons
have blast areas (as in everything effectively destroyed) in the tens
of miles radius depending on burst height.

EMP a few hundreds/thousands miles.

And travelling at, as near as damn it, the speed of light. The shock
wave will be way behind it. Modern example the the shock from the
Chelyabinsk meteor explosion(*) arrived with enough umph to shatter
windows minuets after the explosion had been witnessed.

(*) Estimated to be 400 to 500 kilotons. Hiroshima was about 16
kilotons, Nagasaki about 21 kilotons.

--
Cheers
Dave.