الفهرس 
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Abstract
The present study aims to estimate the environmental radiation hazard in El-Manzala lake, East of Nile Delta, Egypt and its surroundings areas by measuring the radon concentrations of all samples. In order to achieve this goal we divided the thesis into two parts: The first part is the soil samples and the second part is the water samples. Soil samples each of 5 kg were collected from 20 different areas of the lake, with distances far of 5 Km from each other. The locations of the samples were obtained using GPS. Certain procedures have to be done upon the samples before investigations; they were dried, grinded, sieved to become homogeneous and finally heated in an oven. After these procedures, the samples were stored in plastic containers in the presence of two different detectors (CR-39 and LR-115). The water samples each of 6 liters were collected from 22 different locations, then they were concentrated by boiling up to 1 liter, and similar to the soil samples, they were stored in plastic containers in the presence of the same two detectors. After storing, to reach secular equilibrium, the detectors were etched in NaoH solutions and placed in the field of optical microscope in order to count the alpha tracks density from which the radon concentrations were calculated and also the surface & mass exhalation rates, the working level and the annual effective dose, and also the depth of the each sample, the total organic matter and PH were obtained using specific relations.