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A comment on ‘Criticality safety event’ occurred at LANL’s plutonium facility. Parent comment

Re:‘Criticality safety event’ occurred at LANL’s plutonium f... by rzzzt on Sunday September 24, 2017 @01:11PM (#15325532)
Moderators reflect and slow down neutrons so you get a controlled reaction: https://en.wikipedia.org/wiki/Neutron_moderator
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