1. Plutonium 239 that is recovered when nuclear weapons are disassembled; it is stored in plutonium pits
   - weapons plutonium

Type of: plutonium 239

• J-cloth
• J. B. Rhine
• J. B. S. Haldane
• J. C. Maxwell
• J. Craig Ventner
• J. D. Salinger
• J. E. Johnston
• J. Edgar Hoover
• J. J. Hill
• J. K. Rowling
• J. M. Barrie
• J. M. Synge
• J. P. Morgan
• J. R. Firth
• J.R.R. Tolkien
• jab
• Jabalpur
• Jabat al-Tahrir al-Filistiniyyah
• jabber
• jabberer
• jabbering
• jabberwocky
• jabbing
• jabiru
• Jabiru mycteria