A process for reducing 47Tproton-recoilproportionalcounter pulse-height distributions to fast-neutron energy spectra is described. Required corrections, including.those associated with finite detector size, are analyzed in detail. This procedure provides corrected neutron spectra in the region from about 1 keV up to several MeV. The computer programs uhed in this treatment (WERM, ITERATE, and PSNS) are discussed, and a sample problem illustrates and explai:ns the manner in which these codes function. PREFACE This report describes a treatment of experimental data obtained in fast-neutron spectral measurements by 47T-hydrogen-recoil proportional counting. It is instructive to indicate, at the outset, the assumption is commonly used for many particle-detection systems *Ibid. page 86. * *Overflow (>72 columns) of input data printed on following line.

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