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Kenyatta University (2016)

Radiation exposure levels associated with construction sand from Tharaka-Nithi County in Kenya

Kamunde, Karimi Betty

Titre : Radiation exposure levels associated with construction sand from Tharaka-Nithi County in Kenya

Auteur : Kamunde, Karimi Betty

Université de soutenance : Kenyatta University

Grade : Master of Science (Physics) 2016

Présentation
Natural radioactivity levels and radiation risks due to construction sand mined from Tharaka region of Tharaka-Nithi County in Kenya has been measured. The region is mostly rocky with majority of rocks being volcanic rocks and sedimentary rocks of volcanic origin ; the area is occupationally characterized by sand mining for construction purposes within the County and also in some parts of the neibouring Meru and Embu Counties. The sand is mined along the river banks and also gullies that carry sand from withered rocks within the county. High concentrations of 238U, 232Th and 235U are associated with soils that are developed from acidic magmatic rocks (igneous rocks).The goal of this study was to analyze the level of radiation exposure associated with construction sand from Tharaka region. The activity concentration levels of natural radionuclide (uranium, thorium and potassium) in the sand samples were analyzed using NaI(TI) gamma ray spectrometer. The associated radiological parameters (radium equivalent activity, dose rates, external hazard and internal hazard indices) were calculated based on the activity obtained.

Présentation

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Page publiée le 10 décembre 2016, mise à jour le 7 mars 2018