Study and Estimation of the Ratio of ¹³⁷CS and ⁴⁰K Specific Activities in Sandy and Loam Soils ¹³⁷CS ir ⁴⁰K savit j aktyvum santyki tyrimas ir vertinimas priesm lio ir priemolio dirvo emyje

The present article describes changes in specific activities and fluctuations in the ratio of natural 40K and artificial 137Cs radionuclides in soil samples taken from different places of Lithuanian territory. The samples of soil have been selected from the districts polluted after the accident in Chernobyl nuclear plant performing nuclear testing operations. The study has established the main physical and chemical properties of soil samples and their impact on the concentration of 40K activities. 137Cs/40K specific activities in soil have been observed under the dry weight of the sample that varied from 0.0034 to 0.0240. The results of the study could be used for establishing and estimating 137Cs and 40K transfer in the system “soil-plant”. Article in Lithuanian Straipsnyje nagrin jama gamtin s (40K) ir dirbtin s (137Cs) kilm s radionuklid savit j aktyvum ir j santykio kaita skirtinguose Lietuvos teritorijos dirvo emiuose. Dirvo emio m giniai parinkti i vietovi , kurios buvo labiau u ter tos po ernobylio atomin s elektrin s avarijos ir buvusi branduolini bandym . Tyrimo metu nustatytos pagrindin s fizin s chemin s dirvo emio savyb s ir j poveikis 40K aktyvum koncentracijai. 137Cs ir 40K savitieji aktyvumai dirvo emyje tirti esant sausam m ginio svoriui. 137Cs savitieji aktyvumai sausame dirvo emyje svyravo nuo 1,1±1,0 iki 14,3±0,9 Bq/kg, o 40K savitieji aktyvumai – nuo 326±29 iki 740±15 Bq/kg. 137Cs ir 40K savit j aktyvum santykis skirting vietovi dirvo emiuose kito nuo 0,0034 iki 0,0240 Bq/kg. Tyrimo rezultatai gali būti panaudoti, nustatant ir vertinant 137Cs ir 40K perna sistemoje dirvo emis–augalai.