210Bi – from interference to advantage in 210Pb determination with liquid scintillation counter

Publication date: Available online 19 December 2015
Source:Applied Radiation and Isotopes
Author(s): Marko Štrok, Borut Smodiš, Darja Mazej
A novel method for determination of 210Pb activity concentration using a liquid scintillation counter (LSC) in environmental samples is presented. After radiochemical separation of 210Pb on Eichrom Sr Resin column, the decay product 210Bi starts to in-grow and interfere with the 210Pb during measurement with LSC. Instead of eliminating this interference, a novel method utilizes 210Bi in-growth to improve the detection efficiency and subsequently to lower the minimum detectable activity (MDA). This allows for substantial reduction of the MDA compared to conventional methods.

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