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This study aims to evaluate the specific activity levels in soil and shore-sediment samples due to natural radionuclides;  238 U,  232 Th and  40 K, and man-made  137 Cs of Al–Nigella site, Marsa Matrouh government, Egypt. Soil and shore sediment sample selection, preparation, energy and efficiency calibration, Minimum Detectable Activity (MDA) of the HPGe detector was carried out according to the standard approaches. The activity concentrations of the samples ranged from 3.16 ± 0.04 to 36.28 ± 0.83 Bq kg −1  for  238 U series, 0.582 ± 0.01 to 33.35 ± 0.62 Bq kg −1  for  232 Th series and 7.38 ± 0.18 to 477.64 ± 8.12 Bq kg −1  for  40 K and 0.088 ± 0.002 to 3.98 ± 0.09 Bq kg −1  for the artificial  137 Cs. The Radiological contour maps for Al–Nigella were drawn using Surfer_13 software and the hazards index was estimated according to the results of the radioactivity measurements and their levels. All results obtained are within the permissible world average values and compared with the activity concentrations in different countries. The values of the calculated air absorbed gamma dose rate  D , Annual effective dose  E , Radium equivalent ( Ra eq), External hazard index ( H ex) and Gamma index ( Iγ ) are below the average international recommended limits as reported by UNSCEAR 2008.

Analysis of natural radionuclides and 137 Cs using HPGe spectrometer and radiological hazards assessment for Al-Nigella site, Egypt