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Sultan Qaboos University (2017)

Evaluation of radioactivity in selected soil, water and grass samples collected from northern regions of Oman

Amal Abdullah Bashir Al-Harmali

Titre : Evaluation of radioactivity in selected soil, water and grass samples collected from northern regions of Oman

Auteur : Amal Abdullah Bashir Al-Harmali

Université de soutenance : Sultan Qaboos University

Grade : Master of Science (MS) in Physics 2017

Résumé partiel
This study explores the radioactivity concentration in soil, water and grass in the Northern regions of Oman. The naturally occurring radioactive nuclides of the main series, 238U, 232th, 2350 and 40k and artificial radionuclide 137Cs have been studied by means of low level gamma spectroscopy. Majority of the studied valleys (wadis) are descending from Super Hajar Mountains either towards its east part (coastal area) or the west part (desert). Soil, water and grass samples were collected from headwaters and estuaries of wadis where residences and agriculture activities exist. In soil samples, the results showed that 2*U radionuclide was presented in concentrations of the range (4.5 - 24.0) Bq.kg ’while 232Th was found in the range (2.4 - 20.6) Bq.kg. Ranges of 23-U-and 40K were reported as (0.6 - 2.5) Bq.kg ; and (47 - 296) Bq.kg- respectively. Artificial radionuclide 157Cs-was found in all soil samples in the range (2.8- 11.9) Bq.kg. The hazard parameters, dose rate (D), annual effective dose (Hr), equivalent radium activity (Rae), internal hazard index (Hin), external hazard index (Hex) and gamma representative level index (ly) were all calculated. The values of D, HR and Raey were found in the ranges (6,6 - 33.5) nGy.h", (0.8 - 4.1)*10^- mSv.yr" and (17. ? - 88.6) Bq.kg, respectively. The values of Hin Hex and Lyr were all less than 1. These obtained results remained below the optimum admissible values according to UNSCEAR.

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