The natural radioactive nucleids with long half life in the earth are Uranium, Thorium and Potassium and they contribute to the heat produced in the crust. During decay process of the radioactive nuclides in rocks, emission of α, β, γ particles transform into radiogenic heat. The amount of radiogenic heat per time generated from rocks can be determined by concentration of the radioactive nucleides in the rocks and it is independent of forms, tempereture and pressure of the rocks. Concentrations of radionuclides in the samples can be determined by gamma ray spectrometer or some concentrations were obtained from chemical analysis.
The radioactivity concentrations of U, and Th, K in the soils of the Kestanbol granite area are relatively high, but these values are regarded as typical for the region. The high concentrations are determined from Kozak in the Çanakkale Region. The contributions of radiogenic heat production to lithosperic temperature were discussed.
In this study radiogenic heat production values were estimated from U238, Th232 and K40 concentrations from a variety of granitoid rocks in Marmara region and radiogenic heat rate contributed to lithosperic thermal structure was obtained for Çatalca, Kestanbol and Çanakkale.