About the assumption of linearity in soil-to-plant transfer factors for uranium and thorium isotopes and 226Ra

Comparison of 226Ra nuclide from soil by three woody species Betula pendula, Sambucus nigra and Alnus glutinosa during the vegetation period

“…the concentration ratio (CR) soil/leaves to be about 0.2 when the activity of soil was 3.5 Bq 226 Ra/g DW. The other authors tested mainly fruit crops (Khatir Sam, 1995) and the grasses or pastures (Blanco Rodríguez et al, 2002;Markose et al, 1993;Chen et al, 2005). The soileplant 226 Ra transfer factors published by these authors were in the range from 0.016 to 40.3 depending on the plant species and the type and activity of the soil.…”

“…Phytoremediation studies on the treatment of radioactivity contaminated soils have been carried out using different plant species (Markose et al, 1993;Khatir Sam, 1995;Ebbs et al, 1998;Carini, 1999;Madruga et al, 2001;Blanco Rodríguez et al, 2002;Soudek et al, 2004Soudek et al, , 2007Pulhani et al, 2005;Chen et al, 2005). In most cases herbal species have been used, e.g.…”

Trace elements absorption by citrus in a heavily polluted mining site

“…The transfer of metals from soils to plants can be formulated by transfer factors (TF), which describes the ratio between the plant concentration and the soil content (Blanco-Rodríguez et al, 2002;Chojnacka et al, 2005). The concept of TF assumes a linear relationship between element concentrations in soils (C s ) and plants (C p ):…”

Vertical distribution of natural radionuclides in soils

“…Afterwards, it was inactive for several years, and finally restoration work was performed (1998)(1999). More details about the characteristics of this mine, as well as other studies of interest performed in this area are given elsewhere ( [1][2][3]). Four sampling sites were chosen along a thalweg of the moisture gradient ( fig.…”