Little-studied metal goes critical. (Neptunium Nukes?). Science News | October 26, 2002| | COPYRIGHT 2002 Science Service, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information) Copyright

Scientists first created the artificial element neptunium in 1940, around the time they made the first atoms of plutonium. But because plutonium turned out to be so much better for nuclear weapons, researchers have paid scant attention to neptunium.

Now a team at Los Alamos (N.M.) National Laboratory has measured how much neptunium it would take to make a bomb--the element's critical mass--with far greater accuracy than ever before. From a preliminary data analysis, the investigators find that neptunium's critical mass is around 60 kilograms. The critical mass of ...

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