a liquid scintillation counter made in China was used for measuring
125
I in RIA. An electron density increaser——lead acetate was added to the scintillator liquide. The counting efficiency was about 60% and the background was about 60 cpm.
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references
D. L. Horrocks , Nucl. Instr. Meth. , 133 , 293 ( 1976 ).