Importance

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Abstract

An arrangement for counting liquid scintillation samples on bottom-window multi-well sample plates in a liquid scintillation counter. The sample plates include a plurality of samples wells having light impermeable side walls and a light permeable bottom sheet which covers and forms the bottoms of said sample wells. The liquid scintillation counter includes at least one photomultiplier tube and a sample plate holder. The sample plate holder includes a device to hold sample plates of different sizes and a device to enable transporting of the sample plate holder by the scintillation counter. For preventing light passage between sample wells in the permeable bottom sheet a light permeable adhesive foil provided with black lines or other light passage preventing treatment between the sample wells is attached to the bottom side of the sample plate. In cases where the samples on the sample plate are measured from the top by a single photomultiplier tube the foil is reflective to reflect scintillation light to the photomultiplier tube. In cases where the samples on the sample plate are measured from the bottom by a single photomultiplier tube a reflective adhesive foil is attached to the top of the sample plate to reflect scintillation light to the photomultiplier tube.

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First Claim