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A study has been made of the neutron yield from a natural uranium target in the 100-Mev betatron of the General Electric Company. For electron energies above 40 Mev, the neutron output is proportional to electron energy, for constant current in the betatron orbit. At lower energies, with the same current, neutron yield decreases faster than the electron energy.
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Baldwin et al. (1956) studied this question.
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