The study aimed to evaluate the distribution of 90Sr and its chemical analogue Ca in the system soil–underground plant part–aboveground plant part in dependence on plant species and their growth ecotope and compare accumulation and transfer of these elements in components of the above-mentioned system. 90Sr activity concentration and Ca concentration in the underground and aboveground parts of 6 plant species (Vaccinium myrtillus L., Calamagrostis arundinacea (L.) Roth., Hypericum perforatum L., Dactylis glomerata L., Calluna vulgaris (L.) Hull, Ledum palustre L.) and in the soil of their habitats were determined. The following evaluations were made: (1) the 90Sr and Ca transfer factors from soil to underground plant part and from underground to aboveground plant part; (2) the 90Sr/Ca discrimination factor between underground plant part and the soil and between aboveground and underground plant parts. The research revealed that transfer of 90Sr and Ca from soil to underground plant part and from underground to aboveground plant part in examined plants differs significantly. In many cases 90Sr was more intensively transferred than Ca to the underground and aboveground plant parts. Thus, 90Sr and Ca transfer in the soil–plant system and their metabolism in plant are not entirely analogous.
Keywords: 90Sr, Ca, transfer factor, 90Sr/Ca discrimination factor, activity concentration, plants.