Search results for "neutron irradiation"

showing 3 items of 23 documents

Chlorine loss from polyvinylchloride under neutron irradiation

1997

PVC samples were irradiated for 1 hour with a thermal neutron flux of Φ th =4.71·1011n·cm−2·s−1 and the chlorine lost during irradiation was measured by γ-ray spectrometry. About 15% of loss of chlorine has been observed for untreated samples while samples heated to temperatures of 60 and 80°C for one minute before irradiation have been found to loose about 8% and 3%, respectively. The results indicate an influence of the polymer structure on the release of chlorine.

chemistry.chemical_classificationHealth Toxicology and MutagenesisRadiochemistryPublic Health Environmental and Occupational Healthchemistry.chemical_elementPolymerMass spectrometryPollutionAnalytical ChemistryThermal neutron fluxNuclear Energy and Engineeringchemistrypolycyclic compoundsChlorineRadiology Nuclear Medicine and imagingIrradiationNeutron irradiationSpectroscopyJournal of Radioanalytical and Nuclear Chemistry
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Optical Properties of Natural and Synthetic Minerals

2015

The results of investigation of optical absorption and photoluminescence (PL) of topaz, beryl and yttrium aluminium garnet crystals doped with different concentrations of transition ions exposed to fast neutron irradiation and electron irradiation are presented. We suppose that irradiation leads to the formation of two types of complex centers: "Me2+-F+ (or F) centre" and complex centers, which consist of a cation vacancy and an impurity (iron, manganese and chromium) ion. Exchange interaction between radiation defects and impurity ions during neutron or electron irradiation gives rise to appearance of additional absorption and luminescence band broadening in investigated crystals.

inorganic chemicalsMaterials sciencePhotoluminescenceAbsorption spectroscopyAnalytical chemistrytechnology industry and agriculturechemistry.chemical_compoundCondensed Matter::Materials SciencechemistryYttrium aluminium garnetImpurityVacancy defectElectron beam processingPhysics::Atomic and Molecular ClustersIrradiationAbsorption (chemistry)inorganic compounds; absorption spectra; photoluminescence; neutron irradiationNuclear chemistryEnvironment. Technology. Resources.
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Growth of beryllium oxide nano-structures during thermal treatment of neutron irradiated beryllium

2015

Beryllium oxide nano-structures grown during high temperature oxidation of neutron irradiated beryllium has been investigated. Oxidation of non - irradiated and neutron irradiated beryllium was performed in differential thermal analyzer in an atmosphere of air and its mixture with helium at temperatures up to 1050°C. Structure of beryllium and its oxide was studied by the means of scanning electron microscopy. The growth of beryllium oxide nano-structures – “labyrinth type” layers and nano-rods on the inner surfaces of neutron irradiated beryllium were observed by means of Scanning Electron Microscopy. The size of the rods was 10-100 nm in diameter and up to few micrometers in length. There…

lcsh:TN1-997Materials scienceBeryllium oxideScanning electron microscopeRadiochemistrytechnology industry and agricultureOxidechemistry.chemical_elementThermal treatmentrespiratory tract diseaseschemistry.chemical_compoundchemistryberyllium beryllium oxide neutron irradiation thermal treatment nano structureGeneral Materials ScienceNeutronIrradiationBerylliumlcsh:Mining engineering. MetallurgyHeliumMaterials Science
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