Abstract
The TopCount Microplate Scintillation Counter and the Matrix 9600 Direct Beta Counter are microplate compatible instruments developed to meet the needs of investigators using radioisotope assays adapted for very high throughput. This paper describes these instruments and their application to receptor binding assays. When combined with the appropriate sample handling equipment and filter media, use of these multi-detector instruments improves sample handling efficiency and shortens overall counting time. The assay protocols including filtration through glass fiber mats and membrane filters have been investigated. Results obtained from these new instruments are compared to standard techniques using conventional liquid scintillation and gamma counting.
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