The brightness of backscattering radiation intensity for the lungs, liver, bone under in skin and muscle of a rabbit has been investigated by a fiber-optic design of special construction at the laser wavelengths 0.63, 0.83, and 1.15 micrometers . A satisfactory agreement between the brightness backscattering radiation intensity and the reflection coefficient for a single layer of the blood, liver, skin and muscle is observed. It permits using the previously proposed asymptotic solution of the theory of radiation transfer for weakly absorbing multilayer structures
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