About: Characterization of the Graphite Pile as a Source of Thermal Neutrons

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An Entity of Type : http://linked.opendata.cz/ontology/domain/vavai/Vysledek, within Data Space : linked.opendata.cz associated with source document(s)

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	The absorption cross sections of low energy neutrons obey 1/v law for most materials. Therefore, the detection efficiency of a particular detector increase with decreasing neutron energy. Consequently, most of neutron measuring instruments consist of the detector of thermal neutrons which is located inside of the polyethylene moderator. Development of such instruments requires testing and response calibrations in the field of thermal neutrons. Availability of thermal neutron beams on nuclear reactors is limited and access to them is rather complicated, so it is more convenient to moderate neutrons from the radionuclide neutron sources. Since radionuclide neutron sources are producing fast neutrons it is necessary to use an appropriate moderator material like heavy water or graphite to thermalize neutrons from the source and to avoid thermal neutron capture in the same time. The absorption cross sections of low energy neutrons obey 1/v law for most materials. Therefore, the detection efficiency of a particular detector increase with decreasing neutron energy. Consequently, most of neutron measuring instruments consist of the detector of thermal neutrons which is located inside of the polyethylene moderator. Development of such instruments requires testing and response calibrations in the field of thermal neutrons. Availability of thermal neutron beams on nuclear reactors is limited and access to them is rather complicated, so it is more convenient to moderate neutrons from the radionuclide neutron sources. Since radionuclide neutron sources are producing fast neutrons it is necessary to use an appropriate moderator material like heavy water or graphite to thermalize neutrons from the source and to avoid thermal neutron capture in the same time. (en)
Title	Characterization of the Graphite Pile as a Source of Thermal Neutrons Characterization of the Graphite Pile as a Source of Thermal Neutrons (en)
skos:prefLabel	Characterization of the Graphite Pile as a Source of Thermal Neutrons Characterization of the Graphite Pile as a Source of Thermal Neutrons (en)
skos:notation	RIV/00216224:14330/14:00073300!RIV15-MSM-14330___
http://linked.open...avai/riv/aktivita	P S
http://linked.open...avai/riv/aktivity	P(TA01011383), S
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Veškrna, Martin
http://linked.open.../riv/druhVysledku	O - Ostatní výsledky nezařaditelné do žádného z výše uvedených druhů výsledku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Masarykova univerzita / Fakulta informatiky
http://linked.open...dnocenehoVysledku	6979
http://linked.open...ai/riv/idVysledku	RIV/00216224:14330/14:00073300
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	graphite pile; thermal neutrons; He-3 detector; neutron source (en)
http://linked.open.../riv/klicoveSlovo	thermal neutrons He-3 detector graphite pile neutron source
http://linked.open...ontrolniKodProRIV	[6284B18BB92C]
http://linked.open...in/vavai/riv/obor	IN
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	6 (xsd:int)
http://linked.open...vavai/riv/projekt	Digital spectrometric system of nuclear radiation
http://linked.open...UplatneniVysledku	2014
http://linked.open...iv/tvurceVysledku	Kopecký, Zdeněk Vykydal, Zdeněk Králík, Miloslav Veškrna, Martin Dressler, Jan Jančář, Aleš
http://localhost/t...ganizacniJednotka	14330

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