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Descripción
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| Radiation Portal Monitors installed in border areas to fight illicit traffic, have the capability of detecting both gamma rays and neutrons. Neutron detection is important for homeland security to detect Special Nuclear Materials. Usually, pressurized tubes of 3He-based neutron detectors have been deployed, but this is being affected by the scarcity in 3He supplies; so alternatives to 3He for thermal neutron detection are under investigation. The aim of this work is to study the suitability of 10B+ZnS(Ag) neutron detectors, as an innovative replacement to 3He detectors. Using the MCNPX code, the response of these detectors was calculated for different geometries, varying the PMMA thicknesses. The response was estimated through the amount of 10B(n,?)7Li reactions induced by a 252Cf neutron source at 200 cm distance in two conditions: in free air and in air with ground. Results show that the closer the detector is to the ground, and the higher thickness PMMA, the greater is the efficiency. We conclude that 10B+ZnS(Ag) detectors could be considered as an alternative to the 3He detectors. Eventually, a detector is proposed with an optimized geometry able to detect around 2,5 cps per ng of 252Cf , as recommended by the ANSI Standard. | |
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Internacional
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Si |
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Nombre congreso
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14th Congress of the International Radiation Protection Association |
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Tipo de participación
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960 |
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Lugar del congreso
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Cape Town South Africa |
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Revisores
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Si |
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ISBN o ISSN
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DOI
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Fecha inicio congreso
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09/05/2016 |
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Fecha fin congreso
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13/05/2016 |
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Desde la página
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1 |
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Hasta la página
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8 |
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Título de las actas
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Practicing Radiation Protection Sharing the experience and new challenges |