Journal of Medical Physics
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Year : 2012  |  Volume : 37  |  Issue : 1  |  Page : 54-60

Specific activities of natural rocks and soils at quaternary intraplate volcanism north of Sana'a, Yemen

1 Department of Physics, Faculty of Science, South Valley University, Egypt
2 Department of Physics, Faculty of Science, Assiut University, Egypt
3 Department of physics, Faculty of Education, Toor-El-Baha, Aden University, Yemen

Correspondence Address:
Abdallah Ibrahim Abd El-Mageed
Department of Physics, Faculty of Science, Assiut University
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0971-6203.92721

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The level of natural radioactivity in rocks and soil of 32 samples collected from locations at North Sana'a in Yemen was measured. Concentrations of radionuclides in rocks and soils samples were determined by gamma-ray spectrometer using high purity germanium (HPGe) detector with specially designed shield. The average radioactivity concentrations of 226 Ra, 232 Th, 40 K were determined and expressed in Bq/kg. The results showed that these radionuclides were present in concentrations of 21.79 ± 3.1, 19.5 ± 2.6 and 399.3 ± 16 Bq/kg, respectively, for rocks. For soil, the corresponding values were 48.2 ± 4.4, 41.7 ± 4.5 and 939.1 ± 36 Bq/kg, respectively. Also, the radiological hazard of the natural radionuclide content, radium equivalent activity, total dose rates, external hazard index and gamma activity concentration index of the (rocks/soils) samples in the area under consideration were calculated. The dose rates at 1 m above the ground from terrestrial sources were 38.39 and 86.89 nGy/h for rocks and surface soil, respectively, which present no significant health hazards to humans.

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