The analysis of physical and chemical characteristics of materials (composite or not) via the determination of change in the effective atomic number (Z eff ) can be performed by measuring the relation between the intensities of γ-rays under coherent (Rayleigh) and inelastic (Compton) scattering. The creation of methods for no-contact, non destructive control of Z eff and density ρ of localized areas of the material samples will allow the clarification of the physical and mathematical models of degradation of the composite materials under conditions of high temperatures.For the determination of Z eff , it is necessary to use detectors with high energy resolution, due to the need to distinguish between spectrum lines of coherent and incoherent scattering of γ-rays. Using a solid state Ge(Li) detector, we developed a method for the determination of the effective atomic number, Z eff . This number was determined experimentally for several materials, including Textolite, which has been exposed to high temperature.

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