I didn't know that. Thanks! Also: Second, thermal radiation, as usually defined, also disappears. There is no longer any air for the blast wave to hea

I didn't know that. Thanks! Also: Second, thermal radiation, as usually defined, also disappears. There is no longer any air for the blast wave to heat and much higher frequency radiation is emitted from the weapon itself. So more of the energy of the bomb remains in the x-ray or gamma portion of the spectrum---penetrating radiation, hard to shield against---in addition to the longer effective range.