Abstract

A beaker was filled with a liquid mineral oil scintillator to catch 220Rn from a 228Th source. The liquid scintillator was then transferred to a polyethylene vial which was measured in a custom-built triple-to-double coincidence ratio (TDCR) counter. The measurements were used to determine the 212Pb half-life which was found to be 10.622(7) hours.

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