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  • 1
    Electronic Resource
    Electronic Resource
    Uranium Content Measurements in Building Materials Using Track Detection (2000)
    Springer
    Journal of radioanalytical and nuclear chemistry 244 (2000), S. 41-44 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract In order to use the wood building materials in dwelling construction, uranium content measurements were performed by one of the alpha or fission track methods. The investigated samples were tree and rush samples, collected from different Romanian sites, situated in the vicinity of zones with human radioactive activities, such as: Sapantza, Izvorul Izei (North Romania), Omer and Periprava (Danube River Delta). We have examined the U atom distributions in these samples in order to detect any U contamination due to radioactivity. For each analysed sample, two U track micromappings were obtained in the two track detectors which were put in intimate contact with the sample during reactor neutron irradiations. The obtained track micromappings were studied by optical microscopy. The U distribution and content measurement results are presented and interpreted according to the present norms referring to maximum permissible values of U in building materials in Romania.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006702417896
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  • 2
    Electronic Resource
    Electronic Resource
    Radioactive accumulation in alga samples from Romanian Black Sea coast (1999)
    Springer
    Journal of radioanalytical and nuclear chemistry 242 (1999), S. 419-422 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The natural and artificial radioactivity of the brown algaCystoseira barbata samples collected on the Romanian Black Sea coast in 1996 is reported. The results on137Cs were obtained through gamma-spectrometry, on90Sr by beta-counting of the90Y oxalate precipitated after strontium separation, on226Ra by the emanation method, while the concentrations of U, Th, Pu and Am isotopes were obtained through radiochemical separations using tracers followed by alpha-spectrometry counting of the stainless steel discs after electrodeposition. These results add further evidence thatCystoseira barbata may be used as a bioindicator for radioactive contamination of the coastal waters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02345572
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  • 3
    Electronic Resource
    Electronic Resource
    Correlated concentration distributions of natural alpha-radionuclides in sediment samples along the Romanian sector of the Danube river and the Black Sea coast (1997)
    Springer
    Journal of radioanalytical and nuclear chemistry 221 (1997), S. 203-205 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The concentrations of238U and232Th were determined by neutron activation analysis using epithermal irradiation in 12 sediment samples, collected along the Romanian sector of the Danube river and the Black Sea coast during 1994. The concentrations of226Ra were determined by the emanation method in the same sediment samples. The concentration ranges obtained were compared also with the210Po concentration range for the same sector, reported in a previous paper. The accumulation potential of α-emitting radionuclides in the analysed sediments is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02035267
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  • 4
    Electronic Resource
    Electronic Resource
    Artificial radioactive contamination of sediment samples along the Romanian sector of the Danube river and the Black Sea coast (1998)
    Springer
    Journal of radioanalytical and nuclear chemistry 227 (1998), S. 129-131 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The concentrations of137Cs were determined by in 11 sediment samples, collected along the Romanian sector of the Danube river and the Black Sea coast during 1994 γ-ray spectrometry. The concentrations of90Sr in the same sediment samples were determined by β-counting of the90Y oxalate, precipitated after strontium separation using a strontium extraction chromatography column. The concentration distributions of137Cs and90Sr are compared with the238Pu and239,240Pu concentration distributions in the same samples, reported in a previous paper. The accumulation potential of137Cs,90Sr and plutonium isotopes in the river and sea sediments analysed is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02386444
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  • 5
    Electronic Resource
    Electronic Resource
    Artificial radioactive contamination of sediments along the Romanian sector of the Danube river and the Black Sea coast (1999)
    Springer
    Journal of radioanalytical and nuclear chemistry 242 (1999), S. 683-686 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The concentrations of90Sr,238Pu,239,240Pu and241Am were determined in 12 sediment samples, collected from the bed of the Romanian sector of the Danube river and the Black Sea coast during 1996–1997. The samples were dissolved using a microwave digestion technique which left the refractory part of the samples undissolved. Part of the samples were also dissolved totally by alkaline fusion. The results obtained after radiochemical separations and measurement of the radionuclides by the two dissolution methods were compared recommending the optimum method. The radioactive contamination of the investigated sector in 1996–1997 is compared with the results obtained for the same locations in 1994–1995 reported in previous papers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02347379
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  • 6
    Electronic Resource
    Electronic Resource
    INAA of some phosphates used in fertilizer industries (1997)
    Springer
    Journal of radioanalytical and nuclear chemistry 216 (1997), S. 261-264 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract INAA method for As, Br, Ca, Ce, Co, Cr, Eu, Fe, K, La, Lu, Na, Nd, Sb, Sc, Sm, Tb, Th, U, Yb and Zn determination in raw phosphates and Romanian NPK phosphate fertilizers was applied. The concentration values of uranium and some possible toxic elements in fertilizers are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02033788
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  • 7
    Electronic Resource
    Electronic Resource
    New information about the U/Th sediment contamination provided by the neutron-induced fission activation analysis (1997)
    Springer
    Journal of radioanalytical and nuclear chemistry 216 (1997), S. 253-260 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The possibility to obtain new information about the U/Th contamination using the patterns of the fission track micromapping is put into evidence. For the investigated samples, bed load sediments sampled from Danube river and Delta, fission track micromappings were obtained using the neutron-induced fission of the U and Th elements and the track registration of their fission fragments in muscovite track detectors. Utilising the optical microscopy, these micromappings were used both for U and Th content measurements and for studies of U/Th atom distributions. Considering the “track micromapping pattern” as a characteristic of the U/Th atom distribution in the analysed sample, and basing on the micromapping patterns that were previously obtained for the samples contaminated in the specific conditions, the authors were able to establish: (1) the presence of the contamination of the sediments in spite of the fact that the U/Th concentration values did not exceed the natural background values, (2) the solubility of the U/Th chemical compounds in the initial waste and (3) the presence of a succession of U/Th contaminations as well as the presence of the transported contamination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02033787
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