Select a Weapon Dirty bomb: 0.2 kt Suitcase nuke: 1 kt Feb. 2003 test: 7 kt "Little Boy": 15 kt "Fat Man": 21 kt Shakti-I: 45 kt DF-31: 140 kt B61: 340 kt Mark 28: 1.45 mt Castle Bravo: 15 mt Tsar Bomba: 50 kt Tambora eruption Chicxulub asteroid