It is shocking to discover in this new millennium how few people understand the power difference between an Atomic (fission) and Hydrogen (fusion) explosion, but this is probably why so many laugh at any suggestion of surviving an Atomic (fission) explosion unscathed. To use an analogy, the power of the two explosions are like the differences between that of a fire-cracker and a hand-grenade.
With an Atomic (fission) explosion, as with a large conventional explosion, the main concern is with heat and blast. With a Hydrogen (fusion) explosion, the main concern is that of fallout. Over the course of the last century the probability of what weapons would be used by big countries, small military units, and fundamentalist groups has shifted back and forth. Currently a large conventional or small yield fission explosion is the most likely explosion that would be deployed against civilians, as is revealed by the recent US government emphasis away from fallout shelters and back toward storm/bomb shelters.
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