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Telecommunications and Radio Engineering
SJR: 0.203 SNIP: 0.44 CiteScore™: 1

ISSN Imprimer: 0040-2508
ISSN En ligne: 1943-6009

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Telecommunications and Radio Engineering

DOI: 10.1615/TelecomRadEng.v71.i18.50
pages 1665-1686

A HIGH-EFFICIENCY METHOD OF DETECTION OF FAST NEUTRONS FOR DETECTION SYSTEMS OF FISSIONABLE RADIOACTIVE MATERIALS

V. D. Ryzhikov
STC for Radiation Instruments of STC "Institute for Single Crystals", Kharkov; Institute for Scintillation Materials of NAS of Ukraine, Kharkiv; NSC "Institute of Metrology", Kharkiv, Ukraine State Customs Service of Ukraine, Kyiv, Ukraine
B. V. Grynyov
Institute for Scintillation Materials of NAS of Ukraine, Kharkiv; NSC "Institute of Metrology", Kharkiv, Ukraine State Customs Service of Ukraine, Kyiv, Ukraine
G. M. Onishchenko
Institute for Scientillation Materials, Science Technology Center "Institute for Single Crystals", National Academy of Science of Ukraine, Kharkiv; V. Karazin National University of Kharkiv, 4, Svoboda Sq., Kharkiv, 61077, Ukraine
L. A. Piven
Institute for Scientillation Materials, Science Technology Center "Institute for Single Crystals", National Academy of Science of Ukraine, Kharkiv
O. K. Lysetska
Institute for Scientillation Materials, Science Technology Center "Institute for Single Crystals", National Academy of Science of Ukraine, Kharkiv
L. L. Nagornata
Institute for Scientillation Materials, Science Technology Center "Institute for Single Crystals", National Academy of Science of Ukraine, Kharkiv
I. M. Zenya
Institute for Scientillation Materials, Science Technology Center "Institute for Single Crystals", National Academy of Science of Ukraine, Kharkiv
A. Y. Berezhnoy
Institute of High-Energy Physics and Nuclear Physics, NSC Kharkiv Institute of Physics and Technology NAS of Ukraine, Kharkiv

RÉSUMÉ

Comparative measurements and detection efficiency analysis were carried out for fast neutrons from 239Pu-Be source in a broad energy range of En ∼ 0.1 ÷ 10 MeV using oxide scintillators BiGe3O12, Gd2SiO5, CdWO4, ZnWO4, ZnSe(Te,O) as well as NaI(TI), Csl(TI) and 6LiI(Eu). The experimentally obtained fast neutron detection efficiency by heavy inorganic (oxide) scintillators (Z ≥ 50) reaches ∼ 40-50%. One of the most probable mechanisms ensuring such high efficiency of fast neutron by oxide scintillators is the inelastic scattering reaction (n,n'γ) . It is concluded that heavy oxide scintillators, which at the same time are efficient gamma-detector, allow creation of a highly efficient gamma-neutron detector, which ensures high efficiency of detection of fissionable radioactive materials./i


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