A CASE-STUDY ON UPTAKE OF THORIUM FROM SOIL TO PLANT BY USING X-RAY-FLUORESCENCE SPECTROMETRY

A case study was carried out to determine the uptake of thorium from s oil to plant by using X-ray fluorescence technique. The radioecologica l experiment was undertaken to provide plant/soil concentration ratio (CR) data for thorium using 2 types of plant (barley and common vetch) x 4 levels of Th(0, 1500, 3000, 4500 ppm) x 2 types of soil (acidic a nd alkaline) with different configuration parameters. The calibration of the analytical method for thorium on dry basis of samples is descri bed by using Cd-109 excitation source. The results indicated that the CR values decreased with the corresponding Th concentration in soils w ith a 1000 fold range and differed among soil and plant types.