FIELD: geophysical prospecting, well engineering. SUBSTANCE: device has metering instrument and borehole tool made like cylindrical body with collimation holes which axes are directed under acute angles in frame 32-40 deg with respect to body axis. Inside body there are gamma radiation source and two detectors of gamma radiation placed at distances which are determining by adjacent terms of recurring sequence cited in invention description. EFFECT: more simple construction. 2 cl, 1 dwg
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