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  • 1995-1999  (5)
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Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Recent Evolution of the Multi-Isotopic Radioactive Content in Ice of Livingston Island, Antarctica (1999)
    Springer
    Bulletin of environmental contamination and toxicology 63 (1999), S. 139-149 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001289900959
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A procedure for the determination of very low activity levels of tritium in water samples (1999)
    Springer
    Journal of radioanalytical and nuclear chemistry 241 (1999), S. 93-100 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract We describe the procedure developed for the electrolytic concentration of3H in water, together with systematically applied checks to guarantee the reproducibility of the process and to minimize the variability between water samples concentrated simultaneously in the different electrolytic cells. Starting from initial volume of 250 ml water, we obtained enrichment parameters normally greater than 70%, with a dispersion always less than 5%. Measuring the concentrated and the unelectrolyzed samples under the same conditions, we found that the lowest detectable activities had been improved from around 1.5 to 0.3 Bq/l. This allowed us to quantify the3H activity levels of 100% of the rainwater samples collected in Cáceres from 1994 to 1996. The resulting average value for this period was (0.79±0.38) Bq/l.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02347294
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of geology and soil particle size on the surface-area/volume activity ratio for natural radionuclides (1995)
    Springer
    Journal of radioanalytical and nuclear chemistry 189 (1995), S. 289-299 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The radioactive concentrations of226Ra,232Th,235U and40K in surface soil of the province of Cáceres (Spain) were studied as a function of the geology and grain size. The activities of the four radionuclides in granitic and metamorphic soils have normal frequency distributions, with the mean value being significantly higher for the granitic soils than for the metamorphic soils. Sedimentary soils present asymmetric distributions, and their activities lie between the previous two types. The specific activities of the four radionuclides rises as the particle radius decreases. The equationA e =(P 1/R)+P 2 describes the dependence of the specific activityA e on radiusR, P 1 andP 2 being parameters that are related to the surface area and volume activities of the grains. The isotopes226Ra,232Th and235U accumulate with greater intensity on the surface of the grains than40K. This effect is more pronounced in granitic and sedimentary soils than in metamorphic soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02042608
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Temporal evolution of the3H levels in the surface waters around the Almaraz Nuclear Power Plant (1997)
    Springer
    Journal of radioanalytical and nuclear chemistry 219 (1997), S. 25-31 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract We have quantified the evolution during 1994 of the impact on the Tagus river of liquid releases of3H (51.3 TBq in the cited year), originating from the functioning of the Almaraz Nuclear Power Plant, and conditioned by the management of the cooling reservoir water. Taking into account, on the one hand, that tritiated water is hydrodynamically indistinguishable from untritiated water when both form part of the same mass of liquid, and, on the other, the practically null stratification and forced circulation of the water in the cited cooling reservoir, together with the hydrological fluxes interchanged between the said reservoir and the Tagus river (which is entirely regulated in the section under study and, because of prolonged drought, had a relatively small flow during the study period), we were able to model satisfactorily the temporal evolution of the3H activity in the cooling reservoir.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02040260
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Analysis of the temporal evolution of atmospheric7Be as a vector of the behavior of other radionuclides in the atmosphere (1996)
    Springer
    Journal of radioanalytical and nuclear chemistry 207 (1996), S. 331-344 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The mean weekly levels of7Be in the atmosphere of Cáceres (Spain) was measured for three consecutive years, from 1992 to 1994. The values showed a strongly seasonal behavior, conditioned fundamentally by two effects: (1) the incorporation of7Be into the low layers of the troposphere due to the displacement of masses of air from higher layers caused by the solar irradiation, and (2) the washing of7Be out of the atmosphere by rain. From the quantification of these two effects, the residence time of7Be was determined in the atmosphere at ground level as 10.3 days, with an interval for the standard error of 9.0 and 12.1 days. Modelling the temporal evolution of this radionuclide we were able to explain 90.72% of the variance of the measured activity levels. Using the effective residence time of7Be, we were able to justify the diversity of values obtained for the deposition of137Cs in different soils of the province of Cáceres due to the fallout from atmospheric nuclear blasts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02071239
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    Paper (German National Licenses)
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