FIELD: geophysical prospecting technology, instrumentation engineering. SUBSTANCE: device has cylindrical body with gamma ray source container and gamma ray detectors inside it. Detectors are placed in gamma ray absorbing sell which is made asymmetrical, it has possibility of free axial rotating and it center of gravity has displacement to source and detectors collimating passages. EFFECT: more useful construction for slope wells logging. 2 cl, 1 dwg
