Abstract
The Nile Delta coast is highly active dynamical coastal processing area. The investigation of gamma emitters of the surface sediments collected from Nile Delta coastal profiles revealed that the distribution of the detected natural radioactive materials is dependent mainly on the coastal processes. The average concentrations of 226 Ra, 232 Th and 40 K in the Nile Delta coastal profiles were 23.78±8.54, 23.95±11.79 and 280.93±68.19 Bq/kg, respectively. These average values are lower than the worldwide averages but still within its ranges. The concentrations of the heavy radionuclides 226 Ra and 232 Th were found higher in erosion sites compared with the accretion ones. On the other hand, the light radionuclide 40 K was behave as reverse as the heavy radionuclides that its concentration values detected at the erosion sites were lower than at the accretion ones. Radium equivalent index calculation indicated that all the sediments under investigation can use safely as building materials. The average of the outdoor gamma dose rate was 37.25±9.58 nGy/h and the annual external effective dose was 0.05±0.01 mSv/y and these values were in agreement with the corresponding values at different parts of the world. The distribution of the detected natural radionuclides and grain size in the coastal sediments at surf, breaker and offshore zones has been discussed.
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