The uranium mineralization hosted by the Paleozoic sandstones is one of two types: The first is the syngenetic continental/littoral paleoplacers (refractory Th-U bearing minerals) which were detritus from far distant source rocks. These minerals are mainly uranothorite, thorite, zircon, cheralite, chevickinite, davidite, xenotime, and monazite. Meander loops and channels with deep scours appear to be the most favourable sites for this mineralization. The second is the tectonic-lithologic sandstone-type uranium deposits being epigenetic U-enrichment within the sandstones along the permeable fault zones. It contains saleeite, sodium-meta-autunite, threadgoldite and uvanite in addition to REE-bearing iron and aluminium phosphate minerals; vivianite, goyazite, wavellite, florencite and plumbogummite. The studied Paleozoic sandstones are enriched in P
The radiological effects from 21 soil samples collected from Wadi Nasib area of approximately 40 Km 2 , 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
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