الفهرس 
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Abstract
Port Said is an important coastal Egyptian town, due to its strategic location, its commercial and tourist importance. In addition to that, Port Said have industrial activities such as petrochemical materials industry, paints, cement and building materials as well as petroleum and natural gas fields.
The industrial activities may contaminate the Port Said environment, and most of the residential areas beside industrial areas. So, monitoring the environment of Port Said from time to time is necessary. Many previous studies estimated the contamination of Port Said by radioactive nuclides in soil, but these studies did not cover all areas in addition to the number of collected samples are insufficient.
The current study, covered all Port Said areas industrial, beach and residential. Using gamma high pure germanium detector system Ra226, Ra228, K40 and Cs137 concentrations were determined in 41 samples ( soil and shore sediment). The hazard indices such as radium equivalent index, external hazard index, internal hazard index, gamma radiation representative level index, gamma absorbed dose rate, annual effective dose equivalent, annual gonads dose equivalent and excess lifetime cancer risk were calculated. The Pb concentration was determined by using Ionized coupled plasma optical emission spectroscopy (ICP-OES), and the Geo-accumulation index (I-geo) and the Contamination factor (CF) were also estimated.
In soil samples the activity concentrations of Ra 226, Ra228, K40 and Cs137, ranged from 2.78 to 26.88 Bq/kg (11.59 Bq/kg in average), lower than minimum detectable activity to 19.69 Bq/kg (7.53 Bq/kg in average), lower than minimum detectable activity to 382.34 Bq/kg (218.77 Bq/kg in average), and lower than minimum detectable activity to 1.14 Bq/kg (0.25 Bq/kg in average), respectively. In shore sediments samples the activity concentrations of Ra 226, Ra228, K40 and Cs137, were ranged from 5.48 to 15.17 Bq/kg (10.16 Bq/kg in average), lower than minimum detectable activity to 11.75 Bq/kg (6.91 Bq/kg in average), lower than minimum detectable activity to 448.48 Bq/kg (364.23 Bq/kg in average) and lower than minimum detectable activity to 1.14 Bq/kg (0.38 Bq/kg in average), respectively.
Results indicated that high concentrations of radionuclides as well as high hazard indices values are concentrated around industrial activity areas but these values are still below the permissible concentration of radionuclides and the hazardous indices values that are recommended by UNSCEAR 2000, except for the shore sediment samples along port said beach located near petroleum companies and natural gas field (Zohr Field) that have activity concentration values of K40 slightly higher than the global value (400 Bq/kg) recommended by UNSCEAR 2000.
According to the Geo-accumulation Index (I-geo) and Contamination Factor (CF) for Pb, more than two thirds of soil samples and 80% of shore sediment samples have Pb in a moderately to significantly contaminated status. According to Pearson’s correlation, the origins of the pb from one side and the Ra226, Ra228, and K40 from the other side may be different.