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SELF POTENTIAL OR SPONTANEOUS POLARIZATION
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amplitude apparent resistivity atoms axis body borehole coils component Compton effect Compton scatter conductivity conductor constant current electrodes current flow decay density depends depth detector diagram dipole direction discontinuity distance earth effects electrical electromagnetic method energy equation exploration ferrimagnetic filter frequency gamma ray geoid geological geometry geophone Geophysics give gravimeter gravity ground hole horizontal hydrogen induced induced polarization interpretation ions magnetic field magnetometer magnitude mass measured medium minerals mutual inductance neutrons obtained orebody oxidation phase photon plane poles positive potential electrodes precession primary field principle profiling ratio Rayleigh wave reference ellipsoid reflection refraction relative response rock Schlumberger Schlumberger array secondary field seismic seismology separation shot point shown in Figure signal sonde spontaneous polarization subsurface conductors surface survey techniques Thorium transmitter types typical Uranium usually variations vector velocity vertical voltage weathered layer Wenner array Y-ray zero