Determination of Selenium in Aqueous Samples (RADIOCHEMICAL)
This method describes the isolation of Se in aqueous samples by ion exchange, distillation if
necessary, and precipitation for subsequent analysis of 79Se by liquid scintillation counting
(LSC). It has been applied to high-level radioactive samples from Hanford waste tanks and on
defense waste processing facility (DWPF) samples from the Savannah River Site. The
separation, although difficult, provides a decontamination factor of Se from other b-emitters ofabout 106 and a chemical yield of about 50% or better.