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The Evaluation of Radioactivity Levels and Radiological Hazards from Granite used for Construction Materials |
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PP: 39-45 |
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doi:10.18576/jrna/090107
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Author(s) |
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M. Almeshari,
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Abstract |
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| The activities associated with 226Ra, 232Th, and 40K were quantified on granite rock samples obtained from the protected region southeast of Aswan City. Utilizing γ-ray spectroscopy, the amount of gamma radiation in these samples was measured. with NaI(Tl) detectors. The activity concentrations of 226Ra, 232Th, and 40K were determined based on the measured γ-ray spectra. For 226Ra, the activity concentrations ranged from 10±2 to 90±11 Bq kg-1, with an average value of 26 ± 4.8 Bq kg-1. Similarly, for 232Th, the activity concentrations ranged from 98±6 to 160 ±30 Bq kg-1, with an average value of 122 ± 11 Bq kg-1. Lastly, for 40K, the activity concentrations ranged from 72 ± 3 to 102 ± 9.4 Bq kg-1, with an average of 89 ± Bq kg-1. Several parameters were established to assess the potential radiological risk associated with the radioactivity present in the samples, including the radium equivalent activity, absorbed dose rate, and external hazard index. The radium-equivalent activities (Raeq) observed in all granite samples were below the established threshold of 370 Bq kg-1. The airborne absorbed dose rates, determined by evaluating the three radionuclide concentrations, exhibited a range of 73.6 to 117.7 nanograys per hour. The researchers calculated the yearly effective dose rates, both external and internal. The results showed that the range for external dose rates was between 0.09 and 0.145 mSv.y-1, while the range for internal dose rates was between 0.361 and 0.578 mSv.y-1. The average values for external and internal dose rates were determined to be 0.11 and 0.44 mSv.y-1, respectively. The significance of this topic lies in its importance to the environment, as granites are extensively used as construction and decorative materials. The findings are deliberated upon and juxtaposed with the relevant data published in existing literature. |
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