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<p>The release of neutrons from the nucleus requires exceeding the <a href="page.php?w=binding_energy">binding energy</a> of the neutron, which is typically 7-9&nbsp;<a href="page.php?w=MeV">MeV</a> for most <a href="page.php?w=isotopes">isotopes</a>. <a href="page.php?w=Neutron_source">Neutron source</a>s generate free neutrons by a variety of nuclear reactions, including <a href="page.php?w=nuclear_fission">nuclear fission</a> and <a href="page.php?w=nuclear_fusion">nuclear fusion</a>. Whatever the source of neutrons, they are released with energies</p><p>
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