Estimation of Natural Radioactivity in Soil of Primary Schools at Old City in Najaf | ||||
| Arab Journal of Nuclear Sciences and Applications | ||||
| Article 12, Volume 56, Issue 1, January 2023, Page 117-125 PDF (692.29 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ajnsa.2022.142080.1594 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Rukia Dosh1; Ali k. Hasan2; Ali Abid Abojassim  3
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| 1Faculty of science, university of kufa | ||||
| 22University of Kufa, Faculty of Education for Girls, Department of Physics, Al-Najaf, Iraq | ||||
| 3Department of Physics, College of Science, Kufa Univ., Kufa, Iraq | ||||
| Abstract | ||||
| The specific activity of Uranium-238, Thorium-232, Potassium-40, and Uranium-235 in soil samples of selected primary schools in the old city of Al-Najaf province, Iraq, was investigated for radiological hazards to determine children's and staff's safety in these schools. Fifteen (15) samples were collected from the soil of schools under study, prepared, and transported to the radiation detection and measurement laboratory for analysis with the use of gamma-ray spectroscopy detector NaI(Tl) with a "3x3" crystal. The average specific activities of Uranium-238, Thorium-232, Potassium-40 and Uranium-235 were (17.18 ±1.63, 24.24±1.96, 318.23 ±21.23 and 0.79±0.07) Bq/kg respectively. The concentrations levels for Uranium-238, Thorium-232, and Potassium-40 have been lower than the internationally recommended standard of (33, 45, and 420) Bq/kg. The average values of radium equivalent activity, external hazard index, internal hazard index, gamma index, and alpha index were (76.35±4.97, 0.206 ±0.01, 0.252 ±0.01, 0.569 ±0.03, 0.086 ±0.008) respectively. Furthermore, the average values of absorbed dose rate, annual effective dose equivalent outdoor, annual effective dose equivalent indoor, and excess lifetime cancer risk (ELCR) were (35.85 ±2.31) nGy/h, (0.043 ±0.002) mSv/y, (0.175 ±0.011) mSv/y, and (0.153 ±0.009) respectively. It is observed that all results of radiological hazard parameters due to a specific activity for Uranium-238, Thorium-232, Potassium-40, and Uranium-235 were within the world of safety limits. Therefore, the children and staff whose schools were assessed are deemed not exposed to any radioactive risks. | ||||
| Keywords | ||||
| Radioactivity in soil; NaI(Tl) spectroscopy; specific activity and Al-Najaf province | ||||
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