Radioactivity and Radiological Hazard Effects for Granitic Gneisses at Wadi Abu Rushied Area, South Eastern Desert, Egypt

A three main types of measurements were performed in order to get a complete assignment for radioactivity impacts for the studied area,i) A ground gamma-ray spectrometric survey has been performed using a portable gamma-ray spectrometer model Rs-230., The gamma-ray spectrometric maps acquired indicate various concentrations of radioactivity over the studied area, which reflects a contrasting radioelement contents for the exposed rock. ii) The activity concentrations of naturally occurring radionuclides in the area under investigation, were determined using high pure germanium detector (HPGe) with a specially designed shield, in order to assess the radiological health hazards.Absorbed dose rate (D), radium equivalent (Raeq), external hazard index (Hex), annual effective dose equivalent (AEDE), representative level index (Iγ), excess lifetime cancer risks (ELCR) and annual gonadal dose equivalent (AGDE) are calculated.The results were compared with the international recommended values, higher values for both activity concentrations and radiation indices were measured for the studied samples. iii) The activity ratios in the selected samples are calculated to clues for what happened in the studied rock. Groundwater circulation and Weathering, lead to different physico-chemical conditions affecting 238 U and 234 U will result in their fractionation and, thus, the respective activity ratios will therefore be greater or less than unity.