FIELD: mining industry. SUBSTANCE: device has a neutron source and a radiation detector both of which are hung through a pulley on a carriage and linked by cable to a nut traveling along a horizontal lead screw, which has eyes for engaging spring-loaded hooks hinged on the carriage, the hooks being released by spring-loaded levers set up in fixed position on guides. EFFECT: increased analysis rate, reduced radiation hazard, diminished measurement errors. 2 dwg
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