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  1. 百度百科
    https://baike.baidu.com/item/钚-239

    钚-239 - 百度百科

  2. 维基百科
    https://zh.wikipedia.org/wiki/钚

    钚 - 维基百科，自由的百科全书

  3. 百度百科
    https://baike.baidu.com/item/钚

    钚（化学元素）_百度百科

  4. ChemBK
    https://www.chembk.com/cn/chem/PLUTONIUM-239

    PLUTONIUM-239_化工百科 - ChemBK

  5. 知乎
    https://www.zhihu.com/question/451248…

    为什么原子弹爆炸的条件是铀的临界质量，而不是临界 …

    2021年3月26日 · 如果你没有做成单兵或班组武器的需求，阿尔法态钚239已经很够用了，无需追求盲目的高密度。 实验显示，一吨的炸药等外部装置可以让 …

    • 评论数: 2
    • 知乎
      https://www.zhihu.com/question/379465698

      那个内爆式原子弹里面的核燃料为什么是被压缩到高密度的超临界 …

    • 其他用户还问了以下问题
      What cities are in the 239 area code?
      Other cities in the 239 area code include: North Fort Myers, Marco Island, Lehigh Acres, Sanibel, Fort Myers Beach, Ochopee, Bokeelia, and Winter Haven. Fort Myers is the county seat and commercial center of Lee County, Florida, United States.

      Where is Area Code 239? | Fort Myers, Naples, & Cape Coral, FL - Spokeo

      spokeo.com
      What is the significance of the number 239?
      Area code 239 is a telephone area code in the North American Numbering Plan (NANP) for a large part of Southwestern Florida. The numbering plan area includes Lee and Collier counties, small parts of Hendry and Charlotte counties and the Everglades National Park in Mainland Monroe County.

      Area code 239 - Wikipedia

      en.wikipedia.org
      What are the most notable things about the239 area code?
      Area code 239 is located in southern Florida and covers Cape Coral, Lehigh Acres, and Fort Myers. It is the only area code that serves the area. What time zone is area code 239? The 239 area code is located in the Eastern timezone. The Eastern time zone is also known as America/New_York.

      239 Area Code - Location map, time zone, and phone lookup

      allareacodes.com
      What is the 239 area code split from?
      The numbering plan area includes Lee and Collier counties, small parts of Hendry and Charlotte counties and the Everglades National Park in Mainland Monroe County. The area code was created on March 11, 2002, in an area code split in which the southern half of area code 941, from North Fort Myers, was renumbered with 239.

      Area code 239 - Wikipedia

      en.wikipedia.org
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    • 百度百科
      https://baike.baidu.com/item/镎239

      镎239 - 百度百科

    • 知乎
      https://www.zhihu.com/question/641200131

      地球上什么已知物体能量密度最大？ - 知乎

    • 百度文库
      https://wenku.baidu.com/view/0f88313d56270722192e...

      钚-239的理化性质及制备 - 百度文库

    • 搜狗百科
      https://baike.sogou.com/v7892547.htm

      钚239 - 搜狗百科

      2024年10月15日 · 钚-239（239Pu)裂变速度快，临界密度小，要用三米厚的水泥才能挡住核辐射。 有些核性能比铀-235（235U）好，是核武器重要的核装料。 钚-239的毒性大，生产成本高，要建造复杂的生产堆和后处理厂，才能实现工业 …

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