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Neutron source
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=== Photodisintegration === [[Gamma ray|Gamma radiation]] with an energy exceeding the neutron [[binding energy]] of a nucleus can eject a neutron, a process known as [[photodisintegration]]. Two example reactions are: *<sup>9</sup>[[Beryllium|Be]] + >1.7 MeV photon β 1 neutron + 2 <sup>4</sup>He *<sup>2</sup>[[Hydrogen|H]] ([[deuterium]]) + >2.26 MeV photon β 1 neutron + <sup>1</sup>H
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