Although North Korea's bombs were tested in a mountain cave, radioactive isotopes were detected by a US military aircraft. Seismic readings were also obtained at the nearby Chinese city of Dandong. "The blast was less than a kiloton," He said, "It was a fizzle."
By comparison, the first plutonium nuclear device tested by the US in 1945 yielded 20 kilotons. If the North Korean nuclear test is less than even a kiloton in yield, it could be classified as a "fizzle," indicating that some aspect of the bomb design or nuclear material production did not function correctly, He explained.
In his research, He also found that North Korea used impure plutonium 239 as fissile material mixed with some plutonium 230. "As a result, North Korea produced a dud."
On October 16, 1964, when a Chinese defense leader reported to Mao Zedong that China had successfully tested its first atomic bomb, Mao could not believe it and reportedly questioned, "Probably you are cheating me by exploding a huge pile of explosives." It was not until after Mao saw the scientific data measured by the top nuclear scientists that he allowed the official Xinhua News Agency to dispatch bulletins announcing China's successful test of the bomb, and a nationwide celebration was launched.
But after the nuclear tests, North Korean leaders hurriedly organized mass celebrations while the US lost no time in denouncing North Korea. The US and South Korea used North Korea's "nuclear paper tiger" as an excuse for carrying out large-scale military drills in the Yellow Sea, which included a nuclear-powered US aircraft carrier, and were viewed by China as a grave military provocation.
Pyongyang is certainly trying. US nuclear scientist Siegfried Hecker, who recently went to North Korea, says North Korea has secretly built a facility with 2,000 centrifuges to enrich uranium.
"Uranium enrichment would give the North a better way to make atomic bombs than its previous plutonium-based program," He commented.
"But with only 2,000 centrifuges, it will take the North at least 10 years to produce 30 to 50 kilograms of uranium 235 to make a real bomb."
The author is a professor of Tsinghua University. His blog: blog.sina.com.cn/lixiguang2010. xiguang@tsinghua.edu.cn
主站蜘蛛池模板： 老熟女高潮一区二区三区| 大学生粉嫩无套流白浆| 国产成人综合美国十次| 中文字幕天堂网| 美女被视频在线看九色| 国内精品久久久久久99蜜桃| 亚洲国产精品热久久| 老司机久久影院| 国产成人久久久精品二区三区| free哆啪啪免费永久| 日本高清乱理论片| 亚洲综合一二三| 色噜噜狠狠狠狠色综合久一| 国产精品爽爽va在线观看无码| 中文字幕精品视频在线观| 欧美成人午夜做受视频| 又粗又紧又湿又爽a视频| 1024人成网站色| 少妇人妻偷人精品一区二区| 亚洲va久久久噜噜噜久久| 窝窝视频成人影院午夜在线| 国产影片中文字幕| 亚洲成a人片在线看| 天天综合网天天综合色| 久久国产亚洲精品无码| 欧美日韩精品一区二区三区高清视频 | 久久婷婷五月综合国产尤物app| 特级aaaaaaaaa毛片免费视频 | 国产乱理伦片在线观看| 1000部国产成人免费视频| 国内揄拍国内精品少妇国语| bollywoodtubesexvideos| 日本免费一区二区三区最新| 亚洲国语在线视频手机在线| 精品国产污污免费网站入口| 国产成A人亚洲精V品无码性色 | 好吊妞视频这里只有精品| 在线视频一区二区三区| 中文字幕免费在线视频| 操动漫美女视频| 乱e伦有声小说|