FIELD: physicochemical analyses of materials; proximate inspection for osmium isotope tracer on equipment. SUBSTANCE: recorder has transmitter incorporating high-frequency oscillator of 107+-0.5 MHz and pulse shaper, inductance coils, and receiving circuit including local oscillator, mixer, detector, output amplifier-shaper, and inductor. Recorder also has synchronizer connected to pulse shaper and output amplifier-shaper. EFFECT: improved design. 5 cl, 1 dwg
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