Behavior of Radionuclides and their Ratios in Granitic Gneisses with their Environmental Impacts, Abu Rushied Area, Southeastern Desert, Egypt.

Abstract

The thesis aimed to Study the radionuclides determined in metamorphic rock type (granitic gneisses) in order to identify the alteration processes which happened in Abu Rusheid area, South Eastern Desert, Egypt.

The study area was surveyed on a suitable grid pattern. The tectono-stratigraphic sequence of the Precambrian rock units of the studied area are metamorphic rocks, layered metagabbros set in metasediment matrix, granitic genisses and granitic rocks.

A total of 41 points covered the study area and 41 rock samples were taken for radiometric and geochemical analysis.

To achieve this target, we perform measurements in the field and lab.

In the field, ground spectrometric surveying using a portable gamma-ray spectrometer model Rs-230, was carried out over the studied area. The premised area was selected for the details study based on its high radioactivity and mineralization. The obtained results for dose rate, eU, eTh in ppm, K in %, and their ratios eU/eTh, eU/K and eTh/K, where the value of eU/eTh ratio is important for uranium exploration because it depends mainly on the mobility of uranium. Therefore, it outlines the most promising area of uranium migration and accumulation. The resultant of the 3D maps are show different radioactivity levels, which reflect contrasting radioelement contents for the exposed gneisses granite.