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Plutonium and uranium isotopic analysis in the x-ray region with CdTe detector

We demonstrated the wide-range isotopic analysis of plutonium with a portable Peltier cooled CdTe detector in late 2000. These were the first results of this kind for a non-cryogenic detector. The energies used in those early analyses were in the range 125-414 keV. We have since extended the analysis into the X-ray region where the gamma rays are many times more intense than in the higher energy region. We describe the plutonium and uranium analysis of CdTe spectra in the X-ray region.