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  • Author or Editor: D. Bódizs x
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Abstract  

The possible extension of the comparator technique of reactor neutron activation analysis into the field of epithermal neutron activation has been investigated. Ruthenium was used for multi-isotopic comparator. Experiments show that conversion of the so-called reference k-factors—determined by irradiation with reactor neutrons—into kepi-factors usable at activation under cadmium filter, can be evaluated with fair accuracy. Sources and extent of errors and their contribution to the final error of analysis are discussed.

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Abstract  

Normal motor oil have been analyzed by RNAA using thermal neutrons and single comparator method. The samples were taken from the oil carter of an engine. The concentration of trace elements have been measured as a function of running kilometers by -ray spectrometry. The trace elements which have been detected are Na, Mg, Al, Cl, V, Mn, Cu, Cr, Fe, Co, Zn, Br, Sb and Cd.

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Abstract  

A semi-automated instrumental gamma-spectrometric measuring system with a sample changer has been developed for determination of the radioactive fission products coming from different parts of the primary coolant circuit. The measuring geometry assures higher sensitivities under normal operation conditions and lower ones for significant fuel cladding failures. The minimal detection limits are in the range of some ten Bq/l.

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Abstract  

A simple and effective method has been developed for the determination of the transuranium isotopes in primary coolant samples of WWER-440 type reactors. Membrane filters containing undissolved particles from about one liter coolant were destroyed by mineral acids, then americium-curium isotopes and neptunium-plutonium isotopes were coprecipitated sequentially with NdF3 based on their different redox behavior. Alpha-spectra were determined by silicon semiconductor detectors connected to multichannel analyzers. Activity ratios measured in a reactor unit with a failed fuel element were compared with calculated values of the same type of reactor under similar conditions. Parameters of the defective fuel (burnup, original enrichment) could be estimated.

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