FIELD: investigation of lithologic content and three- dimensional density of rock upon gamma logging of exploration wells. SUBSTANCE: device has cathode housing, anode, which is mounted along its symmetry axis on support insulators and is designed as thread, which carries rigid bridges which are designed as glass beads, which have diameter of at least 1 mm and split anode thread into component pieces, which length is uniformly altered from one end of anode thread to another one. EFFECT: increased functional capabilities for running complex investigation of deposits. 2 cl, 1 dwg
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