[en] This work shows the variation of ⁹⁰Sr and ¹³⁷Cs in atmospheric fallout in the Bucharest-Magurele area during 1986-1987. The amount of ⁹⁰Sr in the fallout was estimated to be about 900 Bq.m^-2 in 1986 and about 9.2 Bq.m^-2 in 1987. The amount of ¹³⁷Cs was estimated to be 13300 and 615 Bq.m^-2 in 1986 and 1987, respectively. (author) 10 refs.; 3 figs

[en] The paper presents the activities of radionuclides in the rain that fell in Bucharest-Magurele area on May 2nd, 1986. The artificial radionuclides measured were: Sr-89, Sr-90, Ru-103, Ru-106, Sb-125, I-131, (I+Te)-132, Cs-134, Cs-137, (Ba+La)-140, Ce-141, Ce-144, originating in the nuclear accident at Chernobyl. The activities of I-131 and Cs-137 were 28700 Bq/m² and 3610 Bq/m² respectively. (authors)

[en] This paper presents the results of radioactivity studies of environmental factors such as surface water, sediment, aquatic vegetation and soil. The concentrations of ¹³⁷Cs, ⁹⁰Sr, ³H, U, Ca and Mg in water samples were determined by radiochemical and chemical methods. Gamma-spectrometric analyses were performed for all the samples. The analysis showed a decrease in concentrations of ¹³⁷Cs in water, aquatic vegetation and sediment, but a constant level of ¹³⁷Cs activity in soil (0-5 cm depth). The average concentrations of ⁹⁰Sr, ³H, U Ca and Mg were about 7 mBq/l, 11 Bq/l, 0.6 μg/l 60 mg/l and 11 mg/l, respectively. (author) 12 refs.; 7 figs.; 3 tabs

[en] The dynamics of ¹³⁷Cs soil-to-plant transfer has been studied for 21 vegetal species in an agricultural area not far from Bucharest, during a two year experiment started one year after the Chernobyl nuclear accident. The results, generally fitting in the value ranges found in literature, are discussed in the strict sense of the definition for soil-to-plant transfer of radionuclides. (author) 12 refs.; 5 tabs

[en] This paper presents results on the concentration of ¹37Cs, ⁹0Sr, ³H in water samples from 5 locations in NW Black Sea collected in 1999. In sediment samples, ¹37Cs, Pu radionuclides and ²41Am were determined as well as some major and minor elements by X ray fluorescence. After chemical separation by applying a combined sequential procedure, ²39⁺²40Pu, ²38Pu and ²41Am were measured by high-resolution alpha-spectroscopy. Liquid Scintillation Counting was applied for measuring of 241Pu. For the surface water samples, ¹37Cs concentration varied between (26.3 ± 3.4) mBq/l and (41.2 ± 5.6) mBq/l. The concentration of ⁹0Sr was of about 11 mBq/l. The concentration of tritium was low between 24 and 7 T.U. Higher radioactive concentrations in sediment were found in the samples collected from the stations located close to Danube river. For ¹37Cs values up to (128± 6) Bq/kg were found, in agreement to results for NW Black Sea in previous years. The measured concentrations of ²39⁺²40Pu, ²38Pu radioisotopes are within the range of the values reported in earlier research for the Western Black Sea and Bulgarian Black Sea Coast

[en] The topic of this paper is the development of the biosphere model in the frame of the preliminary performance assessment of the Romanian National L and ILW repository, Baita-Bihor. The work presents the actual understanding of the radionuclide pathways through the repository adjacent area and their conceptualization, collection of required data, implementation of model and preliminary calculation results. The model takes into consideration a leaching scenario from the near field and the transport of radionuclides by river water. The critical group is a small community of inhabitants relying on the local resources, which constitutes an agriculture community 'small farm system'. On the basis of the defined specifications (biosphere equations and data), application of model and dose rate estimates were performed by the ABRICOT code. (author)

[en] The experience of dealing with geographical and environmental data requests by different codes used for the assessment of radionuclide contamination and for the identifying the optimal remedial strategies for recovering the contaminated ecosystems conducted to the developing of an extended GIS database. This connects to the geographical features an Object Oriented database (OODB) comprising: population, land use, soil type and characteristics, hydrological networks (topologically defined, together with hydraulic parameters). Two problems occurred during the process: - The Price/Quality balance of the data: was solved using data source issued by profile research Institutes and the data acquiring with variable scale having higher resolution in the nuclear risk zones; - The choice between Vector and Raster GIS data types: vector files were preferred, because these can be easily grid transformed

[en] Radioactive concentrations of several artificial and natural radionuclides were determined in water and sediment samples collected from various locations in the NW Black Sea in December 1999. For water samples, ⁹⁰Sr and ¹³⁷Cs activity concentrations were of approximately 11 mBq/l and 26.3-41.2 mBq/l, respectively. The concentration of tritium ranged from 7 to 24 T.U. In sediment samples, maximum concentrations of ¹³⁷Cs, ^239+240Pu and ²⁴¹Am were found of 128 ± 6 Bq x kg^-1, 1.8 ± 0.1 Bq x kg^-1 and 0.05 ± 0.04 Bq x kg^-1, respectively. For U and Th radionuclides, the concentrations ranged from 20-80 Bq x kg^-1 and 30-50 Bq x kg^-1, respectively. The results were consistent with those reported in earlier research for the Black Sea. (author)

[en] The authors present the main temporal marks of the history of a nuclear waste disposal site designed on multi-barrier principle, considering a 'time cut-off' of 10,000 years. Collective dose is considered as a representative parameter of the radiological impact assessment and its calculation can be done using an impact scenario elaboration procedure like the one described in this work. It is considered that a more realistic radiological impact assessment can be done only by a permanent comparison between experiment and the mathematical modelling of the radionuclide transport phenomena from repository to the biosphere. (Author)

[en] In this paper the authors present the use of a portable high resolution gamma spectrometer in the measurement of the surrounding area of a former repository for radioactive wastes, decommissioned more than 15 years ago. In the spectra recording this work the presence of Co-60 was evidenced. (Author) 2 Figs., 1 Tab., 6 Refs