Use paraffin in the delayed neutrons, in order to facilitate the measurement of paraffin contain lots of hydrogen. A hydrogen nucleus is almost equal to the mass of the Proton, neutron, which has. When a neutron from the stem before the paraffin, which run through these neutrons will have run into protons (hydrogen nuclei), making myself slow down rush by running these slow neutrons have a better chance of running fast neutrons.
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