  Untagged gamma-ray and tagged-neutron yields from 241AmBe and 238PuBe
mixed-field sources have been measured. Gamma-ray spectroscopy measurements
from 1 - 5 MeV were performed in an open environment using a CeBr3 detector and
the same experimental conditions for both sources. The shapes of the
distributions are very similar and agree well with previous data.
Tagged-neutron measurements from 2 - 6 MeV were performed in a shielded
environment using a NE-213 liquid-scintillator detector for the neutrons and a
YAP(Ce) detector to tag the 4.44 MeV gamma-rays associated with the
de-excitation of the first excited state of 12C. Again, the same experimental
conditions were used for both sources. The shapes of these distributions are
also very similar and agree well with previous data, each other, and the ISO
recommendation. Our 238PuBe source provides approximately 2.6 times more 4.44
MeV gamma-rays and 2.4 times more neutrons over the tagged-neutron energy
range, the latter in reasonable agreement with the original full-spectrum
source-calibration measurements performed at the time of their acquisition.
