4 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:

  3. ® says:

    “What journalists should know about the atomic bombings” by Alex Wellerstein, published June 9th, 2020 http://blog.nuclearsecrecy.com/2020/06/09/what-journalists-should-know-about-the-atomic-bombings/
    Preface: “As we approach the 75th anniversary of the atomic bombings of Hiroshima and Nagasaki, even with everything else going on this year, we’re certainly going to see an up-tick in atomic bomb-related historical content in the news. As arbitrary as 5/10 year anniversaries are, they can be a useful opportunity to reengage the public on historical topics, and the atomic bombs are, I think, pretty important historical topics: not just because they are interesting and influential to what came later, but because Americans in particular use the atomic bombings as a short-hand for thinking about vitally important present-day issues like the ends justifying the means, who the appropriate targets of war are, and the use of force in general. Unfortunately, quite a lot of what Americans think they know about the atomic bombs is dramatically out of alignment with how historians understand them, and this shapes their takes on these present-day issues as well.”

  4. Santayana says:

    As Hiroshima bombing turns 75, a look at 6 changes to nuclear arms under Trump (USA Today) https://www.usatoday.com/story/news/world/2020/08/04/hiroshima-bombing-turns-75-six-nuclear-arms-changes-under-trump/5533700002/
    Among the recent developments:
    The Trump administration has withdrawn from a 2015 nuclear accord with Iran and world powers designed to limit Tehran’s nuclear capabilities.
    President Donald Trump-led talks with North Korea’s leader Kim Jong Un aimed at denuclearization on the Korean Peninsula have stalled.
    The Trump administration has suspended compliance with the Intermediate-Range Nuclear Forces Treaty, a Reagan administration-era initiative that slashed the number of midrange missiles held by the U.S. and Russia.
    Trump has abandoned the Open Skies Treaty – negotiated by President George H.W. Bush after the collapse of the Soviet Union and designed to be a check on nuclear weapons by allowing surveillance flights over signatories’ territories.
    Trump has signaled he may not renew New START, the last major U.S.-Russia nuclear arms control treaty, unless China also agrees to be bound by its constraints. Beijing has not committed either way. New START expires in February, just weeks after there’s a new, or renewed, U.S. president in the White House.
    Marshall Billingslea, the top U.S. envoy for nuclear negotiations, has confirmed the Trump administration has discussed holding the first nuclear test since 1992. “I won’t shut the door on it, because why would we,” Billingslea said in late June in Vienna, Austria, although he said there is no reason to carry out a test “at this time.”
    [See links]

    “He was an American child in Hiroshima on the day the atomic bomb dropped : Howard Kakita was visiting his grandparents when the United States destroyed the Japanese city 75 years ago.” https://www.washingtonpost.com/graphics/2020/history/howard-kakita-hiroshima-atomic-bomb-survivor/
    “…neither he nor his brother were supposed to be in Japan at all. Born in California, they were Americans, like their mother and father before them, like unknown numbers of U.S. citizens who were caught in that city on that day and forever after associated with the atomic bomb and the horrors it unleashed.
    A dozen servicemen, crew members of aircraft downed in the final days of the war and held as prisoners, died after the bomb detonated. But hundreds, some say thousands, of other Americans also perished or suffered and bore witness. Many were children from Hawaii and the West Coast who had arrived in the prewar years to visit relatives or absorb the culture of their families’ heritage. Now, 75 years later, their numbers are dwindling. Even the youngest are in their 80s.”

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.