There is a need to find a replacement for the 252 Cf sources currently used in Standards-
based performance testing of neutron instrumentation. This is a result of its relatively short
half-life, concerns about future availability and recent increases in cost. A potential
replacement source, 244 Cm is evaluated in this study where two commercially available
sources have been acquired and their neutron emission spectra measured using a pair of
spectrometers. Both instruments showed the 244 Cm spontaneous neutron spectrum to be …