Activity of thorium-234 {234Th CAS 15065-10-8} per unit volume of the water body [particulate >53um phase] by filtration and beta spectroscopy PartTh234_>53um Activity of thorium-234 {234Th} in the particulate material between the size fraction >53um suspended in a water body. 2015-08-17 14:53:26.0 SDN:P01::A234TH02 SDN:P01::A234TH02 SDN:P01::A234TH02 2 2 2015-08-17 14:53:26.0 accepted false