The build-up region of the depth dose distribution for a neutron beam produced by the d-T reaction was a topic of interest at the recent conference (Particles and Radiation Therapy, II) held in Berkeley, California. Dosimetry measurements (Greene and Thomas, 1968; Rossi, 1971; Smathers and Almond, 1976) have indicated that the entrance dose for a d-T neutron beam is about 70% of the dose at maximum build-up. For a neutron beam produced by 50 MeV deuterons on beryllium the corresponding dose is 40% (Smathers and Almond, 1976).
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Otte et al. (1977) studied this question.
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