. . . . . . . . . . . . . . . . . "Activity standard error of thorium-234 {234Th CAS 15065-10-8} per unit volume of the water body [particulate >51um phase] by filtration and beta spectroscopy"@en . . . . "accepted"@en . . . . "The standard error of the mean (defined as the standard deviation divided by the square root of the sample size) of multiple determinations of the specified phenomenon."@en . . "SDN:P01::SE234TH5" . "PartTh234_>51um_SE" . . . . .