Scintillation counters using liquid luminescent media for absolute standardization and radioactive assay

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Abstract
A scintillation counter designed for the standardization of radioactive isotopes by 4 si-beta-counting, and for the radioactive assay of small biological samples by gamma-counting is descr. The instrument uses a liquid luminophor in conjunction with an uncooled end-window photomultiplier tube. Details are given of performance with various commonly used radioactive isotopes.