Volume 3, Issue 5, September 2017, Page: 41-46
Assessment of Radon Concentration within Construction Materials Used in Wolaita Sodo, Ethiopia
Nigus Maregu Demewoz, Departments of Physics, College of Natural and Computational Science, Wolaita Sodo University, Wolaita Sodo, Ethiopia
Received: Aug. 8, 2017;       Accepted: Sep. 15, 2017;       Published: Oct. 10, 2017
DOI: 10.11648/j.rst.20170305.11      View  1299      Downloads  67
Abstract
The inhalation of radon decay products is the second most leading reasons for lung cancer after smoking. Building materials are an important source of indoor radon. This article describes the determination of the exhalation rate of radon from construction materials by the use of commercially available digital radon measuring device. Six types of construction materials were collected from the study area; these are cement, metal, sand, rock, clay brisk and gypsum. The measurements of effective radium content and radon concentration in those materials were investigated. The concentration was measured by alpha spectroscopy detection technique with Corentium digital radon detector. It was found that the overall average radon concentration in the construction materials varied from 58.46 Bq/m3 to 307.84 Bq/m3, which is above the recommended action level. The average effective radium content varies from 69.85 Bq/kg to 367.79 Bq/kg which is below the maximum permissible value of 370 Bq/kg as recommended by Organization for Economic Corporation and Development (OECD) but it is near to maximum, so it can pose significant threat to the population. The average annual effective inhalation dose varied from 0.53 mSv/yto 2.77 mSv/y. The mean excess lung cancer risk estimated by this work was found to range from 1.17% to 6.16% within average value of 2.92%. The average of Excess Lifetime Cancer Risk (ELCR) is greater than with the estimated risk of 1.3% due to a radon exposure of 148 Bqm–3 which is the action level of Environmental protection agency (EPA). The mass exhalation rates of radon vary from 14.98 × 10−6 to 97.91 × 10−6 Bq.kg−1.d−1 with a mean value of 57.91×10−6 Bq.kg−1.d−1. The surface exhalation rates of radon have been found to vary from 23.85 × 10−5 to 155.91 ×10−5 Bq.kg−1.d−1 with a mean value of 91.46 ×10−5 Bq.kg−1.d−1. This indicates the contributions of construction materials in the indoor radon are very high.
Keywords
Effective Radium Content, Radon Exhalation Rates, Inhalation dose, Life Fatality Risk, Corentium Radon Detector
To cite this article
Nigus Maregu Demewoz, Assessment of Radon Concentration within Construction Materials Used in Wolaita Sodo, Ethiopia, Radiation Science and Technology. Vol. 3, No. 5, 2017, pp. 41-46. doi: 10.11648/j.rst.20170305.11
Copyright
Copyright © 2017 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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