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The specific activities of  238 U,  232 Th and  40 K in soil and shore sediments from the Mediterranean Sea Coast of Alexandria have been determined using direct gamma spectrometry with a HP-Ge detector and absorbed dose rates in air were calculated. The specific activity of  238 U was determined by laser fluorimetry after applying a radiochemical separation. The specific activities of  238 U,  235 U,  234 U,  238 Pu and  239+240 Pu were determined using an alpha spectrometer based on surface barrier detectors after applying sensitive radiochemical procedures. The specific activities of  238 U obtained by the three techniques were compared. The isotopic ratios  234 U/ 238 U and  238 Pu/ 239+240 Pu were calculated for evaluation of the geochemical behavior of the nuclides. Plutonium concentrations were compared with some reported values in other different marine ecosystems.

Natural radionuclides and plutonium isotopes in soil and shore sediments on Alexandria Mediterranean sea coast of Egypt