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4 May 2012 MOX assay using He-4 scintillation detectors
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A neutron spectroscopic technique for plutonium content measurement is described. The technique exploits the kinematic cuto of neutron emission from (α, n) reactions on oxygen. The Watt spectrum of ssion neutron emission extends to higher energies without such a cuto. 4He scintillation detectors were calibrated with an energy cut to reject neutrons of low energies, thereby making the detectors sensitive only to ssion neutrons but not to neutrons from the (α, n) reaction on oxygen. Experimental results are presented. Simulations are discussed to evaluate possible self shielding eects. Furthermore, numerous factors in uencing gamma rejection are discussed.
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David Murer, Rico Chandra, Giovanna Davatz, Hannes Friederich, Ulisse Gendotti, and Ramsey Jebali "MOX assay using He-4 scintillation detectors", Proc. SPIE 8358, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIII, 83581P (4 May 2012);

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