NATURAL RADIOACTIVITY LEVELS AND EVALUATION OF RADIOLOGICAL HAZARDS IN SOME EGYPTIAN ORNAMENTAL STONES

Geological materials usually contaminated with naturally occurring radioactive materials (NORM) have become a focus of great attention.The radioactivity concentrations of 226Ra, 232Th and 40K Customizer Part in some ornamental stones in Egypt, were measured using a high-resolution gamma ray spectrometer.The natural radionuclide contents, (Ra) equiv

The ultrastructural characteristics of euspermatogenesis and mature euspermatozoa of Cerithidea cingulata are Linear ICs described.Euspermatogonia possesses a large round concentric nucleus with one or two nucleoli.The spermatocyte is characterized by the abundant cytoplasmic organelles and eccentric nucleus with chromatin distributed throughout as