FIELD: logging of holes by method of induced activity of carbon and oxygen. SUBSTANCE: neutron generator has sealed jacket, source of Penning ions, source of gas, accelerating electrode and target as in known neutron generator in sealed tube and it additionally contains special chamber for target, unit for ion beam input and focusing, ring detector of accompanying alpha particles installed in chamber for target, gas absorber and alpha-particle collimator. EFFECT: increased accuracy of registration of carbon/oxygen ratio. 15 cl, 10 dwg
