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Wyświetlanie 1-3 z 3
Tytuł:
Plutonium isotopes 238Pu, 239+240Pu, 241Pu and 240Pu/239Pu atomic ratios in the southern Baltic Sea ecosystem
Autorzy:
Struminska-Parulska, D.I.
Skwarzec, B.
Powiązania:
https://bibliotekanauki.pl/articles/47991.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
plutonium isotope
plutonium concentration
Baltic Sea
ecosystem
Chernobyl disaster
atmospheric fallout
marine sample
accelerator mass spectrometry
Opis:
The paper summarizes the results of plutonium findings in atmospheric fallout samples and marine samples from the southern Baltic Sea during our research in 1986–2007. The activities of 238Pu and 239+240Pu isotopes were measured with an alpha spectrometer. The activities of 241Pu were calculated indirectly by 241Am activity measurements 16–18 years after the Chernobyl accident. The 240Pu/239Pu atomic ratios were measured using accelerator mass spectrometry (AMS). The 241Pu activities indicate that the main impact of the Chernobyl accident was on the plutonium concentration in the components of the Baltic Sea ecosystem examined in this work. The highest 241Pu/239+240Pu activity ratio was found in sea water (140 ± 33). The AMS measurements of atmospheric fallout samples collected during 1986 showed a significant increase in the 240Pu/239Pu atomic ratio from 0.29 ± 0.04 in March 1986 to 0.47 ± 0.02 in April 1986.
Źródło:
Oceanologia; 2010, 52, 3; 499-512
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plutonium isotopes 238Pu, 239+240Pu and 241Pu in the Baltic Sea ecosystem
Autorzy:
Strumińska, D. I.
Skwarzec, B.
Mazurek-Pawlukowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/147762.pdf
Data publikacji:
2005
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
plutonium
238Pu
239,240Pu
241Pu
Baltic Sea
Chernobyl accident
Opis:
In the paper there are presented the results of plutonium 238Pu, 239+240Pu and 241Pu determination in different samples of the Baltic Sea environment. 238Pu and 239+240Pu isotopes were measured in alpha spectrometer and 241Pu results were calculated indirectly by activity measurements of 241Am isotope increase from b-emitting 241Pu in 16-18 years after Chernobyl accident. The results indicate that the Baltic organisms accumulate plutonium from environment and the bioconcentration factors (BCF) range from 100 for fish to 27,000 for priapulida (benthic organisms) and only 0.1% of total plutonium is deposited in living organisms. Almost whole plutonium is deposited in Baltic sediments (about 99%). The results of 241Pu determination indicate that after Chernobyl accident indicate on its high concentration in analyzed components of the Baltic Sea ecosystem and the highest value of the activity ratios 241Pu/239+240Pu were found in seawater (140).
Źródło:
Nukleonika; 2005, 50,suppl.1; 45-48
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radionuclides of iron (55Fe), nickel (63Ni),polonium (210Po), uranium (234U, 235U, 238U) and plutonium (238Pu, 239+240Pu, 241Pu) in Poland and Baltic Sea environment
Autorzy:
Skwarzec, B.
Strumińska, D.
Boryło, A.
Powiązania:
https://bibliotekanauki.pl/articles/148606.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
radionuclides
iron
nickel
polonium
uranium
plutonium
Baltic Sea
Opis:
The paper presents the results of determination of natural [polonium (210Po), uranium (234U, 235U, 238U)] and artificial radionuclides [iron (55Fe), nickel (63Ni), and plutonium (238Pu, 239+240Pu, 241Pu)] in Poland and the southern Baltic Sea ecosystem as well as the recognition of their accumulation process in the trophic chain. All presented results is a summary of long lasting studies realized by the present authors. Results of this study indicated that the principal sources of 55Fe and 63Ni in the Baltic Sea environment is the release from Swedish nuclear power plants. Investigation on the polonium 210Po and plutonium 238Pu, 239+240Pu and 241Pu concentration in Baltic and land biota revealed that these radionuclides are strongly accumulated by some species. Moreover, it was found that fish, mushrooms, cigarettes constitutes important sources of 210Po for people. The Baltic Sea algae, benthic animals and fish concentrate uranium only to a small degree. In Baltic sediments, the concentration of uranium increases with core depth and it is connected with the diffusion of 234U, 235U and 238U from sediments. The values of 234U/238U activity ratio in the sediments indicated that the reduction process of U(VI) to U(IV) and the removing of autogenic uranium from seawater to sediments in the Gdańsk Deep constitutes a small part only.
Źródło:
Nukleonika; 2006, 51,suppl.2; 45-51
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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