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- Author or Editor: G. Kolesov x
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Abstract
Methods of digestion of samples by acidic dissolution and in fused sodium peroxide were modified in conformity with the chemical composition of basalts, periotites and stone meteorites as well as the method of REE pre-concentration by the lanthanum fluoride cycle. The enriching methods were used for the neutron-activation determination of the individual rare-earth elements in rocks and meteorites with a sensitivity up to 10−8%.
Abstract
Elemental composition and uranium isotope ratios for individual 
hot
particles have been obtained by instrumental neutron activation analysis. It has been found that maximum235U enrichment factor in particles (K=3.6; 2.65%235U) does not differ much from the initial value of loaded fuel (K=2.8; 2%235U). From the abundances of fission radionuclides the fuel burn-up, depletion factors of Ru and Cs, and fuel content were calculated.
Abstract
Some aspects of sample analysis (for example, sampling, sample preparing, experimental conductions) from estuaries zones of the west part of Pacific shore have been discussed. The content of elements with different physico-chemical and geological properties in the water samples, suspended matter, bottom sediments, plankton and aerosols have been studied by the methods of neutron activation analysis, X-ray fluorescence and also atomic emission (with ICP) and atomic absorption. Some peculiarities of their distribution and accumulation have been revealed.
Résumé
On a déterminé la composition élémentaire d'échantillons de régolite lunaire obtenus par Luna 16 dans la mer d'abondance par méthode radioactive à l'aide d'un générateur de neutrons ainsi qu'un spectromètre γ à scintillations et détecteur Ge(Li).
