A number of physical properties of the fast neutron fields produced when 8 MeV deuterons or 23 MeV${}^{3}{\rm He}$ ions are incident upon a thick beryllium target have been measured. These include the relative angular dose distributions, the linear dose attenuation coefficients of steel, lead, and a polyethylene mixture, depth dependence of the total dose, the gamma-ray dose and the neutron planar fluence, and the distribution of dose in linear energy transfer at various positions in the fields.

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