A.V. Goodsell, W.S. Charlton,
"Quartz-Crystal Spectrometer for the Analysis of Plutonium K X-Rays,"
Proceedings of GLOBAL 2011
, Makuhar, Japan, December 11-16, 2011.
The ability to quickly quantify the Pu content within spent
nuclear fuel (SNF) is essential to nuclear forensics.
Analysis of the Pu PuU to U UPu ratio can provide
information on fuel and reactor history, including age, burnup and
reactor typewhich could contribute to the attribution of a fuel
sample. Plutonium concentration data can be acquired
through non-destructive analysis (NDA) by detecting self-induced
x-ray fluorescence (XRF) from Pu in the fuel. However, during
conventional spectroscopy, the characteristic Pu x-ray peak of
interest lies beneath background and requires an extended count
time. Crystal spectrometers allow x-rays of selected
energies, obeying Bragg's law for coherent scattering of incident
photons, to be focused directly onto a detector. This
provides a high signal with limited background by decreasing the
possible Compton interaction in the detector. The
crystal design and the experimental geometry that would allow for
the study of high energy x-rays required further attention.
In addition, a preliminary MCNP simulation of the
energy-direction coupled photon source from the quartz crystal was
used to calculate the improved signal-to-noise ratio of the Pu
x-ray peak above background.
Associated Project(s):Bent-Crystal Spectrometer Analyzing Plutonium K X-Rays for Applications in Nuclear Forensics