title: Simultaneous measurement of 89Sr and 90Sr in aqueous samples by liquid scintillation counting using the spectrum unfolding method.
abstract: Two radiostrontium isotopes, 89Sr and 90Sr, were measured simultaneously by liquid scintillation counter coupling with a full spectrum DPM counting protocol. Strontium was separated from the aqueous media by extraction chromatography using Sr-spec resin. Individual count rates were evaluated from quench correlation curves for 89Sr and 90Sr related with SIS and tSIE quench indicators. The method exhibited a counting efficiency of 95% for 89Sr and 92% for 90Sr within their full energy channels and gave highly precise results when the sample was counted within 4 h after strontium separation. Lower limits of detection were 37 mBq/l for 90Sr and 32 mBq/l for 89Sr with a 60 min counting time.
authors.affiliation: Nuclear Environment Research Division, Korea Atomic Energy Research Institute, Yusong, Taejon, South Korea. khhong@nanum.kaeri.re.kr
authors.forename: K H
authors.initials: KH
authors.lastname: Hong
authors.forename: Y H
authors.initials: YH
authors.lastname: Cho
authors.forename: M H
authors.initials: MH
authors.lastname: Lee
authors.forename: G S
authors.initials: GS
authors.lastname: Choi
authors.forename: C W
authors.initials: CW
authors.lastname: Lee