Study of natural radioactivity and the state of radioactive disequilibrium in U-series for rock samples, North Eastern Desert, Egypt.

Twenty rock samples collected from North Eastern Desert in Egypt have been investigated. Natural radionuclide contents have been measured by gamma-ray spectrometry employing a shielded HPGe detector. The activities of (238)U, (232)Th and (40)K have been determined in Bq/kg dry weight.

Natural radioactivity levels for selected kinds of Egyptian sand.

The monitoring and evaluation of natural radioactivity content of sixty-five different samples of sand used in building materials, black sand and its components, and therapy sand collected from different locations in Egypt have been investigated. The specific radioactivity concentration of 238U, 232Th series, and 40K were measured by gamma-ray spectrometer using a shielded HPGe. The obtained results of 238U and 232Th series as well as 40K are discussed.