  Much of George Dracoulis's research career was devoted to utilizing gamma-ray
spectroscopy in fundamental studies in nuclear physics. This same technology is
useful in a wide range of applications in the area of nuclear forensics. Over
the past several years, our research group has made use of both high- and low-
resolution gamma ray spectrometers to: identify the first sample of plutonium
large enough to be weighed; determine the yield of the Trinity nuclear
explosion; measure fission fragment yields as a function of target nucleus and
neutron energy; and observe fallout in the U. S. from the Fukushima nuclear
reactor accident.
