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Proceedings Paper

Thermal neutron detection with PMMA nanocomposites containing dysprosium fluoride nanocrystals
Author(s): Antonio C. Rivera; Natasha N. Glazener; Nathaniel C. Cook; Salomon Maestas; Brian A. Akins; Leisha M. Armijo; John B. Plumley; Nathan J. Withers; Kenneth Carpenter; Gennady A. Smolyakov; Robert D. Busch; Marek Osiński
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Paper Abstract

Naturally occurring dysprosium is attractive as a neutron detector because of its high thermal neutron capture cross section and high natural abundance. Neutron-induced transmutation of 164Dy results in production of stable isotopes of holmium and erbium (the latter only at sufficiently high neutron fluxes), due to beta decays caused by nucleus instability. This mechanism, unaffected by gamma radiation, can be used to unambiguously detect neutrons, without having to discriminate against an accompanying gamma flux. Optically-enabled thermal neutron detection can be based on significant differences in optical properties of Dy and Ho or Er, which allows to determine the relative fractions of Dy, and Ho, and E in an irradiated sample. In our search for the most sensitive method of differentiating between Dy and Ho residing in the same host material, we produced various Dy- and Ho-containing nanocrystals and uniformly dispersed them in a PMMA polymer matrix. Optical properties of the nanocomposites were analyzed by means of absorption and PL spectroscopy. We also report on neutron irradiation experiments with Dy-containing nanocrystals and our attempts to optically detect neutron-induced conversion of Dy into Ho.

Paper Details

Date Published: 21 May 2012
PDF: 9 pages
Proc. SPIE 8358, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIII, 83581S (21 May 2012); doi: 10.1117/12.921502
Show Author Affiliations
Antonio C. Rivera, The Univ. of New Mexico (United States)
Natasha N. Glazener, The Univ. of New Mexico (United States)
Nathaniel C. Cook, The Univ. of New Mexico (United States)
Salomon Maestas, The Univ. of New Mexico (United States)
Brian A. Akins, The Univ. of New Mexico (United States)
Leisha M. Armijo, The Univ. of New Mexico (United States)
John B. Plumley, The Univ. of New Mexico (United States)
Nathan J. Withers, The Univ. of New Mexico (United States)
Kenneth Carpenter, The Univ. of New Mexico (United States)
Gennady A. Smolyakov, The Univ. of New Mexico (United States)
Robert D. Busch, The Univ. of New Mexico (United States)
Marek Osiński, The Univ. of New Mexico (United States)


Published in SPIE Proceedings Vol. 8358:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIII
Augustus Way Fountain, Editor(s)

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