Transfer factors of natural radionuclides and 137Cs from soil to plants used in traditional medicine in central Serbia

Journal of Environmental Radioactivity

Volume 158-159, July 01, 2016, Pages 81-88

Djelic, G.^a, 

Krstic, D.^a , 

Stajic, J.M.^a, 

Milenkovic, B.^a, 

Topuzovic, M.^a, 

Nikezic, D.^a, 

Vucic, D.^b, 

Zeremski, T.^c, 

Stankovic, M.^a, 

Kostic, D.^a

 

^a  University of Kragujevac, Faculty of Science, R. Domanovic 12, Kragujevac, Serbia
^b  Inst. on Occupational Health Protection NIŠ Vojislav Ilić bb, Nis, Serbia
^c  Institute of Field and Vegetable Crops, Novi Sad, Maksima Gorkog 30, Novi Sad, Serbia

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Abstract

Transfer factors of natural radionuclides and ¹³⁷Cs from soil to plants used in traditional medicine were determined. The transfer factors (TF) were calculated as Bq kg^-1 of dry plant per Bq kg^-1 of dry soil. Mass activity concentrations of ²²⁶Ra, ²³²Th, ⁴⁰K and ¹³⁷Cs in soil and plant samples were measured with high purity germanium detector (HPGe). The concentrations of As, Co, Cr, Cu, Mn, Ni, Pb and Zn were determined, as well as the cation exchange capacity (CEC) and the content of exchangeable cations (Ca, Mg, K, Na). Wide ranges of values were obtained for all the metals, especially for Cr and Ni.The Absalom model was used for determination of the amount of ¹³⁷Cs transferred from soil to plant based on soil characteristics such as pH, exchangeable potassium, humus and clay contents. The estimated transfer factors were in the range from 0.011 to 0.307 with an arithmetic mean of 0.071, median of 0.050, geometric mean of 0.053 and geometric standard deviation (GSD) of 2.08. This value agreed well with that calculated from the measurements of 0.069, geometric mean 0.040 and GSD 3.19. Correlations between radionuclides, metals, physicochemical properties and transfer factors were determined by Spearman correlation coefficient. There was a strong positive correlation between ¹³⁷Cs transfer factor and the ratio of transfer factor for K and ¹³⁷Cs. Principal Component Analysis (PCA) was performed in order to identify some pattern of data. © 2016.

Author keywords

¹³⁷Cs; Absalom model; Mass activity concentration; Medical plants; PCA; Soil

Indexed keywords

Engineering controlled terms: Geometry; Ion exchange; Lead; Manganese; Positive ions; Radioisotopes; Soils

Cation exchange capacities; Geometric standard deviations; High purity germanium detectors; Mass activity; Medical plants; Natural radionuclides; Physicochemical property; Spearman correlation coefficients

Engineering main heading: Principal component analysis

Species Index: Pantolabus