The neutron spectra from the interaction of 14-Mev neutrons with a number of elements have been determined by nuclear plate techniques. The plates were exposed to neutrons from the bombardment of a Zr-T target by 200-kev deuterons when the target was as nearly as possible isolated from all scattering material and when the target was surrounded by a spherical shell of the element to be investigated. The variation of F(E n ), the number of emitted neutrons per unit energy interval with energy (E n ), appears to be Maxwellian in the region 0.5 to 4.0 Mev and may be represented by

Methods are described for preparing Ta–H and Zr–H targets for economic use of tritium. Ratios of hydrogen isotope to metals of about 1.0 were obtained. The use of these targets under deuteron bombardment is discussed.

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