Lithuanian Journal of Physics article / Lietuvos fizikos žurnalo straipsnis

[PDF] http://dx.doi.org/10.3952/lithjphys.51107

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 51, 75–81 (2011)

DISTRIBUTION OF ARTIFICIAL RADIONUCLIDES IN THE BALTIC SEASIDE ENVIRONMENT
R. Druteikienė^a, R. Morkūnienė^b, and B. Lukšienė^a
^aState Research Institute Center for Physical Sciences and Technology, Savanorių 231, LT-02300 Vilnius, Lithuania
E-mail: ruta@ar.fi.lt
^bVilnius Gediminas Technical University, Saulėtekio 11, LT-10223 Vilnius, Lithuania

Received 8 November 2010; revised 14 January 2011; accepted 17 March 2011

Investigation on ¹³⁷Cs and ^239,240Pu activity concentration was undertaken in a coastal zone of the Baltic Sea on the Lithuanian territory to study the vertical distribution of radionuclides (down to 30 cm). The Baltic seaside is one of the regions where the highest radionuclide concentrations after the Chernobyl NPP accident were detected. Moreover, this area is a significant recreational zone, therefore, peculiarities of radionuclide spreading in the environmental ecosystem are important from the radioecological point of view. The obtained results of vertical distribution of ¹³⁷Cs and ^239,240Pu in sand and forest soil suggest that the radionuclide downward migration depends on the structure of matrix and its chemical composition. Besides, the results of radionuclide distribution on the stripe between the Baltic Sea and the Curronian Lagoon indicate that the sea is a possible source of radioactive contaminants.

Keywords: plutonium, radiocesium, activity concentration, sand, forest soil, migration, organic matter

PACS: 28.60.+s, 82.80.-d, 89.40.Cc, 89.60.Ec

DIRBTINIŲ RADIONUKLIDŲ PASISKIRSTYMAS BALTIJOS PAJŪRYJE
R. Druteikienė^a, R. Morkūnienė^b, B. Lukšienė^a
^aValstybinis mokslinių tyrimų institutas Fizinių ir technologijos mokslų centras, Vilnius, Lietuva
^bVilniaus Gedimino technikos universitetas, Vilnius, Lietuva

Tirtas ^239,240Pu ir ¹³⁷Cs savitojo aktyvumo vertikalus pasiskirstymas Kuršių nerijos miško dirvožemio ir Baltijos pajūrio smėlio 30 cm paviršiaus sluoksnyje. Didžiausios ¹³⁷Cs ir ^239,240Pu savitojo aktyvumo vertės nustatytos miško dirvožemio 0–5 cm sluoksnyje, giliau jos eksponentiškai mažėjo. Pakrantės smėlio vertikaliame profilyje abiejų radionuklidų savitasis aktyvumas pasiskirstęs tolygiai. Tyrimų rezultatai parodė, kad radionuklidų vertikalią migraciją miško dirvožemyje lemia organinė medžiaga, kurios kiekis siekia iki 91% viršutiniame 5 cm sluoksnyje. Pakrantės smėlyje radionuklidų savitojo aktyvumo vertikalųjį pasiskirstymą lemia mineralinė matricos sudėtis.

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