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- W38916304 abstract "The concept of the 14-MeV Neutron Activation technique is to non- destructively identify unknown chemical elements or atom fractions in closed containers by irradiating the enclosed material with fast neutrons. Nuclear reactions between the neutrons and the atoms of the materials in the container will generally produce gamma rays of energies that are unique to each atom. Although the gamma ray spectra produced are sensitive only to the elements that are present -- not the specific chemical compounds -- some of the constituents of chemical weapon agents are sufficiently different from those of conventional munitions to easily distinguish them from the latter, and, in most cases, from other chemical agents. This is a non-contact method of non-destructive evaluation with a data collection time projected to be around 10--30 minutes per test item with an appropriate source and detector. Good statistical data from chlorine specimens can be obtained rapidly with a modest-strength neutron source, owing to the large radiative neutron capture cross section of chlorine. Although there is qualitative evidence for the other distinctive constituents of blister and nerve agents, namely, P, S, and F, the signature reactions for these elements have much smaller cross sections and need some combination ofmore » higher neutron flux, longer data acquisition times, or a more efficient detector. This was expected; it is evident from our preliminary data-base measurements made at LLNL, where data collection times of several hours were required to achieve good statistical accuracy in the times on the order of 10--30 minutes, we have ordered a pulsed neutron source with about two orders of magnitude greater average neutron flux than the PuBe source used for all data shown here. 4 refs., 3 figs.« less" @default.
- W38916304 created "2016-06-24" @default.
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- W38916304 date "1991-06-20" @default.
- W38916304 modified "2023-09-27" @default.
- W38916304 title "Tooele NDE test report: LLNL 14-MeV Neutron Activation Group" @default.
- W38916304 hasPublicationYear "1991" @default.
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