Radiological Impacts and Radon Exhalation Rate of Naturally occurring Radioactive younger Granites of Gabal El Faliq and Gabal El Magal El Harami areas, Southeastern Desert, Egypt

G. M. Saleh, S. F. Hassan, M. A. M. Mahmoud, M. A. Rashed


Gabal El Faliq and Gabal El Magal El Harami areas are located in the southern part of the Eastern desert, Egypt. They have ultrmafic rocks, ophiolitic mélange, older granitoids, and younger granites, dissected by various post basic dykes and quartz veins. Alkali feldspar granite and peraluminous granite are represented the younger granites in the two studied areas respectively. Uranophane and meta-autunite are recorded in the two studied areas as the secondary uranium minerals, which occur as micro-fractures infilling or coating on joint surfaces. The studied granites are uraniferous granites, which were considered as favorable environments for uranium depositions.

The samples collected from the two studied granites were excavated to some radiometric measurements such as, radioelement concentration measurements, specific activity, surface radon exhalation rate, and finally radiation hazard indices calculations. The obtained results for the equivalent radium content are ranged from 679.25 to 3087.5 Bqkg-1 for Gable El Faliq area, while they are ranged from 555.75 to 1729 Bqkg-1 for Gable El Magal El Harami area. The surface exhalation rates are ranged from1.23 x 10-5±1.14x10-6 to 1.28 x 10-4± 5.44x 10-6Bqm-2 day-1 for Gable El Faliq area, while they are ranged from 1.02x 10-5± 8.35x 10-7 to 4.63 x 10-5± 2.39 x10-6 Bqm-2day-1 for Gable El Magal El Harami area. The radon exhalation rate measured using can technique shows that Gable El Faliq area is approximately twice than the value measured for Gable El Magal El Harami area.

In the two studied areas, the calculated values for the radiation impact factors; exposure dose, annual effective dose rates, radium equivalent activity, external and internal hazard indices and radioactivity level index are exceed the permissible values recommended by UNSCEARS.


Gabal; Younger granites; Uranophane; Meta-autunite; Radon activity; Exhalation rate; Egypt

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