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News North Korea - Suspicious Seismic Activity

  1. Jan 5, 2016 #1

    Astronuc

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    Breaking News: North Korea claims it has conducted a successful hydrogen bomb test

    South Korea says "artificial earthquake" detected near North Korean nuclear testing site
    http://news.yahoo.com/earthquake-detected-north-korea-not-clear-nuke-test-020439757.html [Broken]

    That will certainly stir things up a bit.
     
    Last edited by a moderator: May 7, 2017
  2. jcsd
  3. Jan 5, 2016 #2

    fresh_42

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    I asked myself where they did get the Pu from. That stuff is so toxic you don't even need a bomb around it.
     
  4. Jan 6, 2016 #3
  5. Jan 6, 2016 #4
    And how can such a defunct country do it on their own? A relatively sophisticated Iran needs major help but a medieval times North Korea can do it on their own?
     
  6. Jan 6, 2016 #5
    What is Pu?
     
  7. Jan 6, 2016 #6

    fresh_42

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    It's probably been an ordinary nuclear and no H-bomb. Nevertheless it's a devastating technology in the hands of a crackpot who suffers a big inferiority complex (in the medical sense). The comparison to Iran is in deed interesting. Historically Iran is really far more sophisticated than North Korea. However, I suppose that many leading scientists and engineers have left Iran since the Ayatollahs are in power which makes it more difficult to build nuclear weapons. But that doesn't explain Kim. Even China is getting more and more afraid what he might do next. What really frightens me is that the Chinese lost control over him.
     
  8. Jan 6, 2016 #7

    fresh_42

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    Plutonium. CNN reported the previously tested bombs were made with it. I believed this because as far as I know you need less of it than you would need with enriched Uranium. And to ignite a Deuterium fusion even if they might have failed you need a powerful and small fission bomb.
     
  9. Jan 6, 2016 #8
    Ohhh... I'm sorry! I think that is Putin :-)
     
  10. Jan 6, 2016 #9

    fresh_42

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    If so I would have written Пу.
     
  11. Jan 6, 2016 #10

    Astronuc

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    They put a lot of resources into military, and they have apparently accessed the technology through espionage. It's relatively easy to produce Pu-239 and separate it, if one has the infrastructure, which NK apparently does. They also have submarines and ballistic missiles.

    The SK government and some western experts are skeptical, but only NK knows what they've done. I heard an estimated yield of 6 kT this morning on NPR, so that's not much of a thermonuclear device, and not even much of a boosted device. However, it demonstrates that they can successfully develop and detonate a device.

    World reacts to N. Korean announcement of hydrogen bomb test
    http://news.yahoo.com/world-reacts-n-korean-announcement-hydrogen-bomb-test-122222377.html [Broken]
     
    Last edited by a moderator: May 7, 2017
  12. Jan 6, 2016 #11

    mheslep

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    How do you know any of this to be the case?
     
  13. Jan 6, 2016 #12

    fresh_42

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    It's the opinion of experts being interviewed in the news. They convinced me in the sense that I find it more likely than the opposite.
     
  14. Jan 6, 2016 #13

    mheslep

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    There's a great deal of room between complete loss of control and its opposite.
     
  15. Jan 6, 2016 #14

    fresh_42

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    It's not really worth debating not knowing Xi. But I'm convinced China would rather had Kim without nuclear power. He is a permanent risk potentially disturbing China's economic development. That's my opinion, no theorem.
     
  16. Jan 7, 2016 #15

    Andrew Mason

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    There was a discussion of this report on MSNBC. Rachel Maddow mentioned concern that an H-Bomb can be made much smaller than a fission bomb. I found that a bit surprising. It would not be surprising that the H-Bomb is smaller per unit of energy released but I had understood that an H-Bomb is detonated by a fission bomb and a fission bomb requires a critical mass of U or Pu so that would seem to limit how small you can make it. So why would an H-bomb be smaller than a fission bomb?

    AM
     
  17. Jan 13, 2016 #16

    Astronuc

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    It wouldn't. I wouldn't trust the media to get any technical details correct.

    Meanwhile - North Korea says nuclear test shows it could 'wipe out' US
    http://news.yahoo.com/un-diplomat-un-working-tougher-sanctions-north-korea-173414677.html [Broken]

    Talk about delusional.
     
    Last edited by a moderator: May 7, 2017
  18. Jan 14, 2016 #17

    mheslep

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    Yes at kt yields, but I'm fairly sure from reading Rhodes that at some (large) yield point a Teller-Ulam fusion-fission weapon becomes smaller mass than a fission only weapon of the same yield, if the fission weapon can be realized at all.
     
  19. Jan 14, 2016 #18

    StatGuy2000

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    I am curious if there has been any independent evidence available or presented that can confirm or refute North Korea's claim that it has conducted a successful hydrogen bomb test, as opposed to the testing of a more powerful version of conventional nuclear bombs which they have tested in the past.
     
  20. Jan 14, 2016 #19

    Andrew Mason

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    She was referring to kt yields. Specifically, she was referring to the size of the bombs dropped on Hiroshima and Nagasaki. Her report is here on youtube. At about 1:50-2:30 she talks about and shows the two WWII bombs and then at about 3:50-4:10 she says that the H-bombs can be made much smaller than A-Bombs.

    AM
     
  21. Jan 14, 2016 #20

    Astronuc

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    Old technology.
     
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