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  • 1
    Electronic Resource
    Electronic Resource
    Solvent extraction studies using tetracycline as complexing agent (1985)
    Springer
    Journal of radioanalytical and nuclear chemistry 92 (1985), S. 79-92 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The behaviour of tetracycline as an extracting agent for strontium, iodine, barium, molybdenum, technetium, zirconium, niobium, cesium, ruthenium, tellurium and uranium has been studied and the influence of the acidity of the aqueous phase upon extraction of the elements mentioned has been examined. Experiments have been made to determine whether or not the species extracted into the organic phase is the complex formed between tetracycline and the elements considered as well as to determine the time of shaking necessary so that the equilibrium between the phases is attained. As a practical application, the possibility of using the tetracycline-benzyl alcohol system for separating the fission products137Cs,140Ba,140La,141Ce,103Ru,95Zr and95Nb from each other and from uranium is presented. The same study has been made for131I,99mTc,99Mo,132Te,239Np and uranium and the steps necessary for the separation of these elements are proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02065392
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  • 2
    Electronic Resource
    Electronic Resource
    Recovery of137Cs from acidic fission products solutions (1986)
    Springer
    Journal of radioanalytical and nuclear chemistry 104 (1986), S. 293-300 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A procedure for the isolation of137Cs from acidic fission products solutions, based on the use of silica gel and zirconium phosphate ion exchangers, is presented. The137Cs recovered by the ion-exchange process is converted to powder by coprecipitation of cesium with ammonium molybdophosphate.137Cs pellets have been prepared by compression of137Cs ammonium molybdophosphate powder using a hydraulic press. An important aspect of this procedure is that it does not require neutralization of the Purex waste.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02163211
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  • 3
    Electronic Resource
    Electronic Resource
    Dispersion model of cesium-137 in surface oceanic waters (1997)
    Springer
    Journal of radioanalytical and nuclear chemistry 222 (1997), S. 209-213 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The137Cs radionuclide dispersion in the marine environment through the compartmental model is reported. The model simulates the surface water contamination caused by routine or accidental radionuclide releases. For the simulation the OCEAN program was applied in the North Sea, near to Sellafield and adjacent areas, based on published transfer coefficient data. The results are in good agreement with the literature and the model developed can be applied to the brazilian coastal regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02034271
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  • 4
    Electronic Resource
    Electronic Resource
    Application of radiochemical methods and dispersion model in the study of environmental pollution in Brazil (1999)
    Springer
    Journal of radioanalytical and nuclear chemistry 239 (1999), S. 477-482 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Methodologies for analysis of anthropogenic and natural radionuclides in marine samples were developed and applied in environmental samples. Results of systematic measurements of these radionuclides have showed that artificial radioactivity levels are in agreement with the values from the regions not affected directly by nuclear accidents or nuclear reprocessing plant discharges and are due to the global fallout. The average concentration of137Cs is of 1.4 Bq·m−3 in seawater, ranges from 13 to 220 mBq·kg−1 in fish, and from 0.4 to 1.8 Bq·kg−1 for sediments.90Sr levels in seawater are of 1.8 Bq·m−3 and in fish vary from 19 to 75 mBq·kg−1. Sediments present concentrations of90Sr lower than 0.8 Bq·kg−1 and for239+240Pu of 0.03 to 0.18 Bq·kg−1.210Po levels in fish range from 0.5 to 5.3 Bq·kg−1. The data generated represent reference values for our country and are used to estimate the intake levels of these radionuclides by consuming of marine products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02349054
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  • 5
    Electronic Resource
    Electronic Resource
    A contribution to the characterization of the aerosol sources in São Paulo (1993)
    Springer
    Journal of radioanalytical and nuclear chemistry 167 (1993), S. 295-307 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Fine and coarse particles in suspension in the atmosphere were collected on two Teflon filters with a dichotomous sampler. The concentration of Al, Br, Ca, Ce, Cl, Co, Cr, Fe, K, La, Mn, Na, P, Pb,, S, Sb, Sc, Se, Si, Sm, Th, V and Zn was determined by ED-XRF and INAA. The elemental concentration was analyzed by means of linear correlation coefficients, enrichment factors and principal factors analysis in order to identify the aerosol sources. The main sources of the aerosol particles were the marine ones, resuspended soil, fuel-oil combustion, phosphatic rocks, refuse incineration and residual high-temperature processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02037188
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  • 6
    Electronic Resource
    Electronic Resource
    Analysis of210Po in marine samples (1997)
    Springer
    Journal of radioanalytical and nuclear chemistry 220 (1997), S. 117-119 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A method for determining210Po in marine samples by wet dissolution, deposition onto silver disc and counting by α-spectrometry is described. Recovery of polonium was obtained with208Po tracer.210Po levels in fish from the Brazilian coast and sediments from Antarctic region were determined. Levels in fish ranged from 0.5 to 5.3 Bq·kg−1 wet and for sediments, mean values of 10 mBq·kg−1 were obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02035361
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  • 7
    Electronic Resource
    Electronic Resource
    Strontium-90 determination in fish from the Brazilian coast (1995)
    Springer
    Journal of radioanalytical and nuclear chemistry 200 (1995), S. 497-507 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A radiochemical procedure for low level strontium-90 analysis in fish samples as well as the levels of this radionuclide in fish collected along the Brazilian coast are presented. The method developed was applied in reference samples from the IAEA in order to verify the precision and accuracy of the methodology established. Results obtained for strontium and yttrium yields were about 90%. Strontium-90 levels in fish bones varied from 3 to 12 mBq.g−1 Ca and these data are reference values to our country.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02162499
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  • 8
    Electronic Resource
    Electronic Resource
    Determination of cesium-137 in water by ion exchange (1989)
    Springer
    Journal of radioanalytical and nuclear chemistry 131 (1989), S. 105-109 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The preparation of ammonium molybdophosphate (AMP) precipitated directly into the IRA-900 resinous structure and their application to the determination of cesium-137 in waters are described. The sample of water is passed through the resin, which retains the cesium. After the removal of strontium-90 and potassium-40 with 0.1M ammonium nitrate solution, the cesium is eluted with 1M sodium hydroxide solution. The AMP dissolved in the alkaline solution is used to precipitate the cesium by acidifying the solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02046614
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  • 9
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    Determination of cesium-137 in water by ion exchange (1989)
    Springer
    Details
    Publication Date: 1989-05-01
    Print ISSN: 0236-5731
    Electronic ISSN: 1588-2780
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Published by Springer
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  • 10
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    Application of radiochemical methods and dispersion model in the study of environmental pollution in Brazil (1999)
    Springer
    Details
    Publication Date: 1999-03-01
    Print ISSN: 0236-5731
    Electronic ISSN: 1588-2780
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Published by Springer
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