The radiological effects from 21 soil samples collected from Wadi Nasib area of approximately 40
Km2, Sinai, Egypt, were measured using gamma spectrometer. CR-39 plastic track detector was used for
radon exhalation rate measurements employing (closed can technique ). The uranium concentrations
were also measured for these samples as well as radium equivalent concentrations. The obtained
results show: The radon exhalation rates were found to vary from 1.48 to 63.36 Bq m−2 h−1. Uranium
concentration varies from 1 to 89 ppm, whereas Radium concentration in soil samples has been found to
vary from 2 to 114 ppm. The radon levels at the depths of 1 m are nearly twice the levels at 0.5 m in the
experimented area. The rate of radon diffusion is found to depend mainly upon medium porosity. The
annual effective dose measured for this area exceeds the permissible values, recommendations and
precaution should be undertaken during any exploration processes in this area