FIELD: medicinal practice in clinical laboratories of radio nuclide diagnostics. SUBSTANCE: invention refers to examination of level of radioactivity of gamma-emitting radio pharmacological preparations based on Tc-99 before their injection to patients. Device has gamma- radiation detector with Geiger counters uniformly arranged around measurement volume. Geiger counters are fitted with calibrated lead shield mounted for movement and screening of measurement volume. Geiger counters are connected with their anodes to output of high-voltage unit and with their outputs to input of converter of signals from Geiger counters to digital form, the latter being connected with its multiposition output to multiposition input of unit computing and visualizing measurement results. EFFECT: simplified design and enhanced functional reliability of device. 1 cl, 2 dwg
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