2 thoughts on “Hiroshima, Japan, August 1945

  1. Mike says:

    “The B61 nuclear bomb is the primary thermonuclear gravity bomb in the United States Enduring Stockpile following the end of the Cold War. It is a low to intermediate-yield strategic and tactical nuclear weapon featuring a two-stage radiation implosion design.
    The B61 is of the variable yield (“dial-a-yield” in informal military jargon) design with a yield of 0.3 to 340 kilotons in its various mods. It has a streamlined casing capable of withstanding supersonic flight speeds. The weapon is 11 ft 8 in (3.56 m) long, with a diameter of about 13 inches (33 cm). Basic weight is about 700 pounds (320 kg), although the weights of individual weapons may vary depending on version and fuze/retardation configuration.” https://en.wikipedia.org/wiki/B61_nuclear_bomb
    The Little Boy Gun type uranium-235 fission bomb dropped on Hiroshima on August 6, 1945, exploded with an energy of about 15 kilotons of TNT. Re: US ‘Enduring Stockpile’ see https://en.wikipedia.org/wiki/Enduring_Stockpile

  2. Footnote says:

    A plutonium, implosion-type bomb, code-named ‘Fat Man’ was dropped on the Japanese city of Nagasaki; August 9, 1945
    The implosion-type device, consisted of a 13.6 lb core of highly enriched sub-critical plutonium 239 about the size of a softball surrounded by 5,300 lbs of high explosives that was designed in such a way so that when it was detonated the explosive force of the HE was directed inwards uniformly, which caused the plutonium core to be compressed to the size of a tennis ball a super-critical state. This resulted in approximately 1 kilogram of plutonium fissioning with an equivalent explosive force of 21,000 tons (21 Kilotons) of TNT.

    This is what Nagasaki looked like 70 years ago, before the bombing on August 9th, 1945 (click to enlarge):

    And this is what it looked like afterwards:

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