الفهرس 
Theoretical AspectsOnly 14 pages are availabe for public view
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Abstract
The radioactivity concentrations of beach sand samples from different
sites along the coast of Al bayda Libya and radionuclides concentration
of different water samples (seawater, well water and tap water) which
collected from this region have been identified using the gamma ray
spectroscopy technique. Collection of samples was carried out during the
low tide, where it is possible to collect sediments from the wet region that
was covered by seawater during the high tide.
The mean specific activities of 226Ra,232Th and 40K in the soil
samples collected along the coast were determined and are found to have
average values 8.26 Bq/kg, 5.95Bq/kg and 66.1 Bq/kg respectively. The
observed radionuclides are belonging to the naturally occurring 238U
(226Ra) and 232Th (228Ra) radioactive series in addition to 40K nuclide.
Concerning water samples the average specific activity values were
0.070 (226Ra), 0.047 (228Ra), and2.300 Bq/L (40K) for seawater; 0.085
(226Ra), 0.070 (228Ra), and 11.250Bq/L (40K) for well water; 0.095
(226Ra), 0.094 (228Ra), and 4.204Bq/L (40K) for tap water. The results
indicate that the measured radioactivity for both well water and tap water
are similar or lower than those published for other non-polluted regions
of the world. Furthermore, the obtained results concerning the annual
effective dose proves that both well water and tap water are very safe and
far below the international recommended limits.
The activity concentration ratios of 210Pb/226Ra ,210Pb/238U and
226Ra/238U for some soil samples were calculated to show the
disequilibrium between daughter and parent nuclei in the coastal marine
sediments.The radiological hazards for the investigated area were
evaluated and are found to be less than the world average.
Additionally, the obtained average specific activity values for
226Ra,228Ra and 40K in well water and tap water indicate that the
consumption of these waters are far from being hazardous.