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Title: Effective Indoor 222Rn Radiation Dose from Concentration on Filtered Air Sample
???metadata.dc.contributor.*???: Dr. Tilahun Tesfaye
Terefe, Temesgen
Issue Date: Jun-2017
Publisher: Addis Ababa University
Abstract: Instantaneous measurements of equilibrium equivalent concentration of radon (EECRn) Counting system were taken over a period of 21 days in Nuclear physics laboratory located in the first floor of the physics building, Addis Ababa University. The method is based on grab sampling of known volume of air on a glass fiber filter of more than 99% retention followed by gross beta counting of the filtered air sample and counted over large number of successive time intervals using an end-window Geiger-Müller (GM) counter. The gross beta count was canalized using a mathematical model based on Bateman differential equations (Papp & Daróczy, 1997) and the experimental count rate was fitted to the mathematical method to determine Equilibrium EquivalentConcentrations of Radon isotopes. The indoor effective dose was estimated fromthe EECs. The values of annual effective doses in Nuclear physics laboratory first floor of closed indoor building for radon were found to vary in the range 0.39mSv/y - 1.93mSv/y, with a mean of 0.99mSv/y. These results are lower than the value 1.15mSv/y recommended by (ICRP-60, 1990). In addition to environmental value of the present survey, the results are considered to be essential in analyzing any data for future activities in this field.
Description: A Thesis Presented To the Department Of Physics Addis Ababa University in Partial Fulfillment of the Requirements for the Degree Master of Science in Physics
Appears in Collections:Thesis - Physics

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