Abstract
Radionuclide concentrations of beach and dune sand from various sites in Al-Arish city and surrounding area, North Sinai, Egypt, were measured. The sampling sites included locations in the local harbor, Al-Arish valley and Zaranik protected area. The results indicate that the activities of the products of
232Th and
226Ra series in samples from the harbor and along the beach were higher than those from non-coastal sites. The activity concentrations of
232Th for beach sand ranged from 2.3 to 506.5
Bq/kg with an average of 83.4
Bq/kg, while that for dune sand ranged from 2.2 to 15.1
Bq/kg with an average of 6.4
Bq/kg. The average activity concentration of
226Ra for beach sand was 56.0
Bq/kg (2.9–261.5
Bq/kg), while that for dune sand was 6.5
Bq/kg (3.0–14.7
Bq/kg). The average activity concentrations of
40K for beach and dune sand were 88.1
Bq/kg and 178.4
Bq/kg, respectively. Six depth profiles in the harbor area were measured up to a depth of 1
m within more than two years. These sets of measurements allowed the determination of the migration rate of black sand to be 0.094
cm/day. Samples with the smallest grain size (<0.2
mm) were found to have the highest level of activities, which were attributed to their high content of black sand.
No risk exists for public health based on the calculated effective dose equivalent and the recommended limit of 5
mSv/y. On the other hand, local children and adults may receive doses higher than this recommended limit in two locations in the Zaranik protected area according to a model developed in this study.