Physical measurements of the neutron beams obtained by bombarding a thick Be target with 24 MeV deuterons and 12 MeV protons included a determination of fast neutron flux with sulfur threshold detectors and of spectrum with nuclear track plates. On the basis of these measurements the first collision neutron dose was computed. The gamma-ray dose associated with the neutron beam was determined by means of photographic emulsion techniques. Comparisons were made with other calibrated neutron sources of similar spectra.
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Tochilin et al. (1958) studied this question.