Abstract
The activity concentrations of some radionuclides (238U, 234U, 230Th, 226Ra, 232Th, 40K and 235U) were measured by γ‐ray spectrometry in order to study their behavior and the relation between them in Carboniferous rock samples collected from Gabal (mountain) Um‐Hamd, southwestern Sinai, Egypt. The whole samples are located in the two limbs and trough of a synclinal form structure to identify the radionuclides migration processes which have occurred in these rock samples. The average activity concentrations of 238U, 232Th, 226Ra, and 40K measured in the all samples except sandy dolostone sample are higher than the worldwide average values as reported by UNSCEAR 2008. The activity ratios (234U/238U) for half of the samples are in equilibrium, while the other half samples are below unity indicates migration‐out of uranium. The hazard indices were also calculated. The variations in lithologic types and the configuration of the structural synform played its roles beside the physical and chemical properties of different radionuclides in their fractionations.
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