Science Target Conference Systems, Ajman 4th International Environment Conference 2016

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Is There Radiation Hazard Around Na'wah Town, SW Sana'a, Yemen Republic? Mohamed Th.S.Heika1*, and Kamal R. Mahmoud2 1Geology Department, Faculty of Science, Tanta University, Tanta 31527, Egypt 2 Physics Department, Faculty of Science, Kafr El Sheikh U
Mohamed Tharwat Salah Heikal

Last modified: 2015-12-10

Abstract


Abstract

The natural radioactivity of 40K, 226Ra, 232Th and 238U  in basement rocks (gneisses, granites and pegmatites) as well as sandstone exposures around Na'wah town (some 223 km SW Sana'a) are determined and calculated. Concentrations of radionuclides in the studied rocks were detected using high efficiency multichannel analyzer of Gamma ray spectrometry (NaI"T1") detector with specially designed shield. The average radioactivity concentration of 226Ra, 232Th, 238U and40K were determined expressed in Bq/Kg.  The radiological and health risk assessment were calculating via main parameters based on the activity concentrations of these elements. Increased values of risk parameters were observed for some sites of uraniferous granites and gneisses (in major) while values measured in pegmatite and sandstone are usual and safe. The results obtained, show that these radionuclides values in uraniferous granites and gneisses  fall within the range of risk values which most probably cause a significant radiation hazards for limited areas of the local and seasonal population around Na'awh town and nearby Guban town. The present data were discussed and compared with those given in the literatures.

 

Keywords: Radiation hazards, radiological assessment, granites and gneisses, Na'awh, Yemen.