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current | 19:37, 16 March 2010 | | 466 × 296 (26 KB) | JWBE | {{Information |Description=This nickel-clad neptunium sphere was used to experimentally determine the critical mass of Np at Los Alamos National Lab. |Source=http://pubs.acs.org/cen/80th/neptunium.html |Date=2002 |Author=Los Alamos National Lab. |Permissi |
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