الفهرس 
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Abstract
The present study aims mainly to investigate the natural radioactivity, construct appropriate method to detect and estimate the subsurface distance of the source of radioactivity in natural rocks by using solid state nuclear track detector SSNTD. The radon concentration as well as the exhalation rate were also measured, however, the radium activity concentration is calculated for the same samples using SSNTD (CR-39). Then comparison between gamma and alpha measurements of 226Ra in different rock types at three sites in two localities, named Wadi El Sahu and Gabal Alouga. Sinai - Egypt.
The diffusion of the radon inert gas, can give a better understanding of its possible pathways through soils and fractured rocks into the air. In the present work, a study of radon diffusion has been developed and applied to estimate the depth of known radioactive location, containing various amounts of radionuclides, of interest. The columns with multistage solid state nuclear track detectors SSNTD (detector chambers) were prepared and used on drilled borehole and fractured zones. Analyses of these detectors indicate that, the diffusion of radon is markedly exponentially changed as the height from the boundary surface of the radioactive anomalies.
The results indicated that, the γ - measurements of 226Ra are usually higher than the α-measurements through radon emanation. This was expressed in four ratios for 226Ra (γ)/226Ra (α) in the different rock types for the all location. These variations in measurements of the two techniques are due to α-recoil and the differences in porosity of different rock types.