Estimation of 232Th Concentration in Environmental Matrices by TrackingActivity of Major Daughter Products (212Bi, 212Pb and 228Ac) with Time in aHermetically Sealed Container

摘要

Concentration of 212Bi, 212Pb and 228Ac were tracked at different time intervals for 33 days in IAEA-RGTh-1 reference material having 2.89% Th and soil collected from ambient environment. In case of reference material, mean concentration of 232Th evaluated using gamma energy line of 228Ac (912 keV) and 212Bi (728 keV) shows a deviation of only 0.05%, and 5.66% respectively from the certified mean value of 232Th, whereas a large negative deviation of 29.9% was observed in the case of 212Pb (239 keV). Th-232 concentration in soil sample as evaluated using above three different gamma lines shows a variation of only 10-13%.