Unique challenges with recent gamma spectroscopy measurements at Los Alamos National Laboratory |
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Authors: | S C Myers D R Porterfield L Tandon |
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Institution: | (1) Los Alamos National Laboratory, Los Alamos, NM 87545, USA |
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Abstract: | A variety of unique radioactive samples have been measured recently at Los Alamos National Laboratory (LANL) using an electrically-cooled
high-purity germanium detector. In each case the purpose of the measurements included one or more of the following objectives:
(1) an accurate determination of the isotopic weight fractions of different plutonium or uranium materials; (2) an accurate
determination of the isotopic quantity in the absence of relevant calibration standards; and (3) a qualitative determination
of various sample impurities for additional forensic information. This paper discusses how simple modifications to the PC-FRAM
parameter sets enabled a better determination of the isotopic content of the following samples: (1) high-purity plutonium
metal, (2) plutonium-beryllium (PuBe) neutron sources, (3) neutron-irradiated natural uranium, and (4) re-processed HEU fuel
with elevated 236U content. The isotopic quantity in a variety of samples was determined using a combination of the Spectral Nondestructive
Assay Platform (SNAP™) routine from Eberline Services and the Monte Carlo Neutral Particle (MCNP) code developed at LANL.
The non-traditional sources that were quantified with these gamma ray modeling codes included dozens of neutron-irradiated
targets of natural uranium, several plutonium-beryllium neutron sources, and three high-purity samples of plutonium metal. |
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