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A (simulated) sphere of plutonium surrounded by neutron-reflecting blocks of tungsten carbide. A re-creation of a 1945 criticality accident to measure the radiation produced when an extra block was added, making the mass supercritical.

From LANL's report on criticality accidents, 2000, http://www.csirc.net/library/la_13638.shtml

Public domain This work is in the public domain in the United States because it is a work of the United States Federal Government under the terms of Title 17, Chapter 1, Section 105 of the US Code. See Copyright.

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