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AbstractAbstract
[en] An irradiation facility was developed by means of which samples can be irradiated near the core edge of the reactor BER II in liquid nitrogen at a thermal neutron flux of 1.5.1013 n.cm-2.s-1 for a maximum of 14 days. The technique of neutron activation analysis is presented in which biological samples enclosed in thin-walled quartz ampoules are irradiated and measured directly without pretreatment. Using this method, losses of iron, zinc and selenium during pretreatment procedures (freeze-drying at 30, 60 and 90 deg C) for the analysis of plasma, erythrocytes and liver were studied. (author) 8 refs., 9 figs
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Secondary Subject
Source
7. International conference on modern trends in activation analysis; Copenhagen (Denmark); 23-27 Jun 1986
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Journal Article
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Conference
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AbstractAbstract
[en] Epithermal neutron activation analysis (ENAA) was applied to the analysis of foods for iodine. The procedure involves irradiation of wet foods in a boron nitride vessel, followed by direct counting of the 442.9 keV gamma ray of 128I without any processing of the sample. Three research reactors were evaluated for use in determining iodine by ENAA. The University of Virginia reactor at Charlottesville was chosen for this study because the reactor facilities minimized thermal heating of the boron nitride vessel, enabling irradiation of larger, more representative analytical portions. Iodine concentrations ranging from 0.003 to 0.74 μg/g are reported for 17 different food matrices. (author) 13 refs
Primary Subject
Source
7. International conference on modern trends in activation analysis; Copenhagen (Denmark); 23-27 Jun 1986
Record Type
Journal Article
Literature Type
Conference; Numerical Data
Journal
Country of publication
ACTIVATION ANALYSIS, BARYONS, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, BETA-PLUS DECAY RADIOISOTOPES, BORON COMPOUNDS, CHEMICAL ANALYSIS, DATA, ELECTRON CAPTURE RADIOISOTOPES, ELEMENTARY PARTICLES, ELEMENTS, FERMIONS, HADRONS, HALOGENS, INFORMATION, INTERMEDIATE MASS NUCLEI, IODINE ISOTOPES, ISOTOPES, MINUTES LIVING RADIOISOTOPES, NEUTRONS, NITRIDES, NITROGEN COMPOUNDS, NONDESTRUCTIVE ANALYSIS, NONMETALS, NUCLEI, NUCLEONS, NUMERICAL DATA, ODD-ODD NUCLEI, RADIOISOTOPES
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AbstractAbstract
[en] At Interuniversity Reactor Institute, a fast rabbit system was installed consisting of polyethylene tubing and a carbonfiber end point at the core position. Carbonfiber combines a good mechanical stability under in-core conditions with a very high purity. It can be expected that as a result of the use of this material, contamination by the rabbit will become negligible, so that samples can be counted directly without unpacking. Results obtained with this new system are presented, and compared with results obtained with an aluminium rabbit system used until now. (author); 6 refs.; 5 figs
Primary Subject
Secondary Subject
Source
7. International conference on modern trends in activation analysis; Copenhagen (Denmark); 23-27 Jun 1986
Record Type
Journal Article
Literature Type
Conference
Journal
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] A simple radiochemical machine incorporating ion-exchange procedures is described. The system was tested repeatedly for the determination of Cd, Co, Cr, Cu, Mn and Mo at ultra trace concentration levels in a variety of biological samples such as reference materials, human blood serum, human milk, hair and certain dietary materials, thereby demonstrating its suitability for practical use. The procedure can also yield results for Ag, Au and W, without any further chemical manipulations. Results are tabulated. This scheme has been applied to process large number of samples from single investigations such as those arising from dietary studies, obtaining quick and reliable data for routine use. (author) 20 refs.; 11 tables
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Source
International symposium on nuclear analytical chemistry; Halifax, Nova Scotia (Canada); 5-7 Jun 1985
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Journal Article
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Conference
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AbstractAbstract
[en] Thermal decomposition of natural siderite and goethite was studied using Moessbauer spectroscopy and x-ray diffraction. Hematite and magnetite were the principal compounds formed during high temperature treatment of siderite. Natural goethite transformed to hematite at high temperatures. The crystal structures, stoichiometry and the nuclear magnetic properties of Fe-oxides formed are discussed. (author)
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Journal Article
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BETA DECAY RADIOISOTOPES, CHALCOGENIDES, CHEMICAL REACTIONS, COBALT ISOTOPES, COHERENT SCATTERING, DAYS LIVING RADIOISOTOPES, DECOMPOSITION, DIFFRACTION, ELECTRON CAPTURE RADIOISOTOPES, EVEN-ODD NUCLEI, INTERMEDIATE MASS NUCLEI, IRON COMPOUNDS, IRON ISOTOPES, IRON ORES, ISOTOPES, MINERALS, NUCLEI, ODD-EVEN NUCLEI, ORES, OXIDE MINERALS, OXIDES, OXYGEN COMPOUNDS, RADIOISOTOPES, SCATTERING, STABLE ISOTOPES, TRANSITION ELEMENT COMPOUNDS
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AbstractAbstract
[en] The experiment SROK-3 proved the method of isotope dilution with alpha-spectrometric end to be suitable for determining the concentration of Pu in solutions of the spent WWER fuel. The participating laboratories manifested their capability to determine Pu at the μg/g solution level with an error of 0.20-2.9 relative %. To increase the precision of results, attention is to be paid to the preparation of sources of α-radiation and to the computer programs for processing the α-spectra. (author)
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Journal Article
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ACTINIDE NUCLEI, ACTINIDES, ALPHA DECAY RADIOISOTOPES, CHEMICAL ANALYSIS, ELEMENTS, ENERGY SOURCES, ENRICHED URANIUM REACTORS, EVEN-EVEN NUCLEI, FUELS, HEAVY NUCLEI, ISOTOPE APPLICATIONS, ISOTOPES, MATERIALS, METALS, NUCLEAR FUELS, NUCLEI, PLUTONIUM ISOTOPES, POWER REACTORS, PWR TYPE REACTORS, QUANTITATIVE CHEMICAL ANALYSIS, RADIOISOTOPES, REACTOR MATERIALS, REACTORS, SPECTROSCOPY, THERMAL REACTORS, TRACER TECHNIQUES, TRANSURANIUM ELEMENTS, WATER COOLED REACTORS, WATER MODERATED REACTORS, YEARS LIVING RADIOISOTOPES
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AbstractAbstract
[en] The techniques employed to measure Th concentrations in acrylic (PMMA) samples at a level of a few tens of ppt are described. Measurements on eleven different acrylic samples yielded a mean Th concentration of 40+-20 ppt. (author)
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Journal Article
Journal
Country of publication
ACTINIDE NUCLEI, ACTINIDES, ACTIVATION ANALYSIS, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, CHEMICAL ANALYSIS, DAYS LIVING RADIOISOTOPES, ELEMENTS, ESTERS, HEAVY NUCLEI, ISOTOPES, METALS, NONDESTRUCTIVE ANALYSIS, NUCLEI, ODD-EVEN NUCLEI, ORGANIC COMPOUNDS, ORGANIC POLYMERS, POLYMERS, POLYVINYLS, PROTACTINIUM ISOTOPES, RADIOISOTOPES, SPECTRA
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AbstractAbstract
[en] A method is described that allows the simultaneous determination of the self-absorption factors of the alpha particles from 226Ra and its daughter products in the final precipitate. For BaSO4 they are 0.360+-0.037 and 5.67+-0.13. This second value corresponds to the ratio between the self-absorption factors of 222Rn, 218Po and 214Po and 226Ra. Four aliquots of the IAEA Low Grade Uranium Ore S-13 with 0.039% U3O8 were analyzed by gross alpha counting using the determined values for these parameters in the 226Ra activity calculations. The mean value of (0.040+-0.002)% U3O8 shows the validity of the results. (author)
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Journal Article
Literature Type
Numerical Data
Journal
Country of publication
ABSORPTION, ALKALINE EARTH METAL COMPOUNDS, ALPHA DECAY RADIOISOTOPES, BARIUM COMPOUNDS, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, CARBON 14 DECAY RADIOISOTOPES, CHARGED PARTICLE DETECTION, CHEMICAL ANALYSIS, DATA, DAYS LIVING RADIOISOTOPES, DETECTION, EVEN-EVEN NUCLEI, HEAVY ION DECAY RADIOISOTOPES, HEAVY NUCLEI, INFORMATION, ISOTOPES, MINUTES LIVING RADIOISOTOPES, NUCLEI, NUMERICAL DATA, OXYGEN COMPOUNDS, POLONIUM ISOTOPES, QUANTITATIVE CHEMICAL ANALYSIS, RADIATION DETECTION, RADIOISOTOPES, RADIUM ISOTOPES, RADON ISOTOPES, SULFATES, SULFUR COMPOUNDS, YEARS LIVING RADIOISOTOPES
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AbstractAbstract
[en] In order to study instrumental charged-particle activation analysis using the internal standard method, simultaneous determinations of several selected elements such as Ca, Ti, V, Fe, Zn, As, Sr, Zr and Mo, in oyster tissue, brewer's yeast and mussel were carried out by using the respective (p, n) reactions and a personal computer-based gamma-ray spectrometer equipped with a micro-robot for sample changing. In the determination constant amounts of Y and La were added to the sample and comparative standard as exotic internal standards. As a result, it was demonstrated that concentrations of the above elements could be determined accurately and precisely. (author)
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Journal Article
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Numerical Data
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AbstractAbstract
[en] The substoichiometric separation of Yb(III) can be achieved by the extraction of a substoichiometric amount of thenoyltrifluoroacetone and an excess amount of phenanthroline in benzene. The appropriate pH range for the substoichiometric extraction is 6-8. The reproducibility of the substoichiometric extraction of Yb(III) is very good (RSD 1%). As an example, Yb in a manganese nodule is determined by the substoichiometry combined with the radioactivation analysis. The content of Yb is 17.63+-0.23 μg/g. The present procedure can be applied to the determination of other rare erath elements. (author)
Primary Subject
Source
7. International conference on modern trends in activation analysis; Copenhagen (Denmark); 23-27 Jun 1986
Record Type
Journal Article
Literature Type
Conference
Journal
Country of publication
ACTIVATION ANALYSIS, AROMATICS, CHEMICAL ANALYSIS, COMPLEXES, ELEMENTS, HETEROCYCLIC COMPOUNDS, HYDROCARBONS, KETONES, KINETICS, METALS, NONDESTRUCTIVE ANALYSIS, ORES, ORGANIC COMPOUNDS, ORGANIC FLUORINE COMPOUNDS, ORGANIC HALOGEN COMPOUNDS, ORGANIC NITROGEN COMPOUNDS, ORGANIC SULFUR COMPOUNDS, PHENANTHROLINES, RARE EARTH COMPLEXES, RARE EARTHS, REACTION KINETICS, REAGENTS, SEPARATION PROCESSES
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