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<p>not generally considered usable in nuclear weapons, 93% is commonly referred to as "<a href="page.php?w=Weapons_grade">weapons-grade</a>". They also have a very high power density in the core, which requires special design features. Like power reactors, the core needs cooling, typically natural or forced <a href="page.php?w=convection">convection</a> with water, and a <a href="page.php?w=neutron_moderator">moderator</a> is required to slow the neutron velocities and enhance fission. As neutron production is their main function, most research</p><p>
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