TECHNIQUE DETERMINING CONTENT OF MAGNESIUM AND CALCIUM OXIDES IN MAGNESITE ORE Russian patent published in 2000 - IPC

FIELD: geophysical investigation of boreholes. SUBSTANCE: technique involves sequential irradiation of investigated rocks by fluxes of gamma-quanta and fast neutrons with use of stationary isotope sources, measurement of flux N₁ of scattered gamma radiation at fixed distance from source of gamma-quanta and subsequent evaluation of quality of magnesite ore by intensity of flux of scattered gamma radiation. Measurement of effective atomic number (Z_eff), life time t of thermal neutrons and summary effective content of aluminum and silicon oxides in investigated ore is conducted in addition. With this in mind soft component N₂ of scattered gamma radiation, one or several fluxes N₃ of thermal neutrons and activity N_a induced by isotope Al-28 are recorded. EFFECT: increased accuracy of evaluation of content of magnesium and calcium oxides. 3 cl, 2 dwg