P. R. Almond, J. B. Smathers, G. D. Oliver, Jr., E. B. Hranitzky, K. Routt, Dosimetric Properties of Neutron Beams Produced by 16-60 MeV Deuterons on Beryllium, Radiation Research, Vol. 54, No. 1 (Apr., 1973), pp. 24-34
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Almond et al. (1973) studied this question.