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Mátel Ľ., Rosskopfová O., Rajec P., Galanda D., Švec, V.,

Distribution of radionuclides in soils in surroundings of Bratislava, capital of the Slovak Republic. II. Ma n -made radionuclides. Mátel Ľ., Rosskopfová O., Rajec P., Galanda D., Švec, V., Department of Nuclear chemistry, Faculty of Science, Comenius University,

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Mátel Ľ., Rosskopfová O., Rajec P., Galanda D., Švec, V.,

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  1. Distribution of radionuclides in soils in surroundings of Bratislava, capital of the Slovak Republic. II. Man-made radionuclides Mátel Ľ., Rosskopfová O., Rajec P., Galanda D.,Švec, V., Department of Nuclear chemistry, Faculty of Science, Comenius University, Mlynská dol. CH-1, 842 15 Bratislava, Slovakia

  2. The actual distribution of the concentrations man-made radionuclides in soil from the area of Podunajske Biskupice is presented. The monitoring was located 12 km southeast from Bratislava centre. Documentation is based on the collection of soil and analysed for 137Cs, 90Sr, 239,240Pu, and 241Am

  3. The soils were analysed using gamma spectrometry - ( HPGe detector with relative efficiencies 28 %, Ortec ) - 137Cs. Analytical procedures involve total dissolution of the samples, followed by radiochemical separation and purification using solvent extraction ( Aliquat-336 - 239,240Pu; TBP - 90Sr ), calcium oxalate precipitation and extraction chromatography an Eichrom TRU Resin - 241Am

  4. Separation scheme for the simultaneous determination of Pu, Sr ( A ); Pu, Am ( B ) - soil, sediment   ashing add tracers 236Pu (242Pu ), 243Am and carriers ( Ba, Pb, Sr, Y ) acid leaching with 8 M HNO3 - H2O2 ( autoclave, 180 0C , 3 times ) plutonium oxidation state adjustment ( NaNO2 ) extraction with equal volume 30 % Aliquat 336 in toluene ( in nitrate form )

  5. Aaqueous Am, Cm ,Y organic Th, Pu, U   evaporate washing with 8 M HNO3 (U) dissolution in HNO3 10 M HCl (Th ) organic Pu aqueousextraction with TBP (Y ) ( discard )stripping Pu with H2C2O4 - HClorganic Y aqueous (discard )stripping with H2O microprecipitation with NdF3precipitation of oxalates ( pH = 2-3 ) Alpha spectrometry of Pu Beta counting of Y-90 ( Sr-90 )

  6. Baqueous Am, Cm organic Th, Pu, U evaporate washing with 8 M HNO3 ( U )10 M HCl ( Th )dissolution in 12 M HCl organic Pu aqueousevaporate (discard )dissolution in 1M HCl stripping Pu with H2C2O4 - HCl ( NH2OH.HCl, Ca2+)calcium oxalate precipitation destroy oxalate dissolved in 2 M HNO3/0,5M Al(NO3)3extraction chromatography ( TRU.Spec Resin )convert to Cl- form with 9 M HCl 4 M HCl - AmMicroprecipitation of Pu, Am with NdF3Alpha spectrometry of Pu , Am

  7. The interval of specific activity (Bq.kg-1) are 137Cs: 14,1 - 83,8 90Sr: 3,8 - 29,2 239,240Pu: 0,130 - 2,904 241Am: 0,704 - 0,580

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