FIELD: instrumentation engineering; monitoring liquid and gaseous media for concentration of radioactive materials. SUBSTANCE: device has set of scintillation light guides uniformly distributed within flask holding medium under investigation, each of them being connected on two ends with two time-and-position sensing photodetectors through light guide; photodetectors are connected to coincidence unit and the latter is connected to signal analyzing and processing unit which is connected to gamma detector. EFFECT: enhanced reliability of measurement results, simplified design, enlarged functional capabilities. 15 cl, 3 dwg
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