If the chargeability of a buried target is not infinitesimal, the popularly used low chargeability approximation can produce large errors in the computation of apparent polarizability spectra. A more accurate alternative approximation, based on a complex, frequency dependent "dilution factor" is presented. It turns out that for dispersions of the minimum phase shift type this approximation can be somewhat simplified and that for targets with such a dispersion, buried in a nondispersive host rock, the apparent log-phase spectrum is only slightly different from a vertically shifted version of the true phase spectrum of the target.--Modified journal abstract.

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