Environmental Study for Radionuclides at Miri Lake Area

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Osman Mustafa, Mukhtar
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Abstract This work is aimed to study a place of high level natural background radioactivity in the Nuba Mountains, Kordufan region, Western Sudan, called Miri. The study was carried in and around a lake situated at this area. The lake is an artificial one, which was formed when a dam was built between two mountains to stop rain water draining along Khor Berdab in the rainy season. The lake is formed on a Uranium-Thorium mineralization zone. Miri area is a populated area (the population is about 15,000- 20,000) in which people live on what is grown in the area. They use lake and well water for drinking and irrigation. Food samples, water and soil samples were collected. For sample analysis the following techniques were used: gamma spectrometry, laser flourimetry, X-ray flourecence and gross alpha-beta measurement and alpha spectrometry. Radon monitoring using the charcoal technique was established and developed to be used in our environmental work at this area and due to security reasons it was not done. Radon was monitored at Khartoum to serve as reference level. In this study the exposure of population to the external and internal radiation is estimated. A Sodium Iodide scintillation detector was used for measuring the external exposure. Environmental samples were collected processed and the radionuclides concentration were determined. Samples from places of normal natural background radioactivity were measured to serve as a reference level for comparison. The natural background radioactivity level at Miri area was found to be in the range of 2.2 - 11.8 folds of the normal level of natural background radioactivity. The upper limit of the population Annual Effective Exposure is estimated to be 41 mSv due to external,' internal exposure due to ingestion with food and water and due to the inhalation exposure from Radon gas. Proposal for protective measures to the population and for future work in the area are presented.
Environmental Study for Radionuclides at Miri Lake Area