The neutron spectrum from a 238Pu-Li source has been measured using spherical proportional counters filled with different pressures of hydrogenous gas. The spectral shape over the energy range 60 keV-1.5 MeV is in good agreement with the calculated spectrum for a similar source and the neutron output obtained by integrating the spectrum is in good agreement with long-counter measurements. The neutrons from the 238Pu-Li source have an average energy of OSOMeV, an average kerma (in soft tissue) of 1.44 nrad . cm'lneutron and 18.2 nrem * cm*/neutron.
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