Indoor Radon Survey in Some Buildings of Mkwawa University College of Education

Background: Radon is a radioactive gas that is found all over the world and is well-known for its capacity to induce lung cancer. Purpose: This study aimed at the determination of indoor radon and its association with the excess lifetime cancer risk (ELCR) and annual effective dose in Mkwawa University College of Education (MUCE). Methods: The measurements of indoor radon concentrations were carried out using radon eye. Results: It was found that the indoor radon concentrations ranged from 0-55.7±4.0 Bq/m<sup>3</sup> with an arithmetic mean of 12.2±3.5 Bq/m<sup>3</sup> which are all below the limit of 100 Bq/m<sup>3</sup> set by WHO. The annual effective dose was estimated in the range of 0.01-0.69 mSv/y with an average of 0.165±0.075 mSv/y which are below the limit of 1 mSv set by ICRP. The ELCR was estimated to be in the range of 0.035-2.415×10<sup>-3</sup> with the mean value of 0.588±0.262×10<sup>-3</sup> which are below 1.45×10<sup>-3</sup> the value of world average. The lung cancer cases per million people per year (LCC) was estimated in the range values of 0.18-12.42 per million persons with mean value of 3.015±1.355 per million persons. The LCC obtained in this study is below the ICRP recommended limit of 170-230 per million persons. Conclusion: The results of indoor radon concentration obtained in this study are well below the limits set by WHO, EPA and ICRP. Hence, the students and staff at MUCE are all safe as the annual effective dose, ELCR, LCC due to radon exposure are within the allowable limits.