Abstract
A sequential analytical method for the determination of 238U, 234U, 234Th, 230Th, 228Th, 228Ra and 226Ra in environmental samples has been developed. Uranium and thorium isotopes are initially separated using tri-n-octyl phosphine oxide (TOPO) supported on a column of silica gel. The uranium isotopes are determined by alpha-spectrometry following extraction with TOPO onto a polymeric membrane. Thorium isotopes are coprecipitated with lanthanum fluoride before counting in an alpha spectrometer. Radium isotopes are separated by coprecipitation with mixed barium and lead sulphate. Radium-226 is determined with the radon emanation technique on a solution of the mixed barium and lead sulphates in ethylene-diamine tetra-acetic acid. Radium-228 is measured by its daughter product 228Ac in a 2 πβγ coincidence counter.
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