Abstract

AbstractRadon is a radioactive gas formed in the decay chains of uranium and thorium. Uranium and thorium are natural radionuclides that are ever present in the Earth’s crust, which form the raw materials of the building. Being radioactive, radon and its progenies emit high-energy alpha particles hence becoming the main percentage contributor to natural background radiation to humans. Thus, this research is focused on the background radiation exposures due to indoor irradiation as an effort to record the preliminary data on radiological risk to the population in UiTM Jengka. Assessment of indoor radon concentration and annual effective dose at selected buildings in UiTM Jengka have been recorded since no such data is available, which started the establishment of the campus in 1993. Assessment of indoor radon concentration and annual effective dose at selected buildings UiTM Jengka was carried out by using solid-state nuclear track detector (CR-39). The radon track detectors were left for about a month in selected buildings and places frequented and occupied by students and staff of UiTM Pahang. The track detectors were then etched and analyzed to determine the radon concentration of the selected location. The range of the indoor radon concentration for all places was 7.42–30.12 Bqm−3 with an average of 15.80 ± 8.66 Bqm−3. The average annual effective dose was found to be 0.40 ± 0.22 mSvy−1 and varies from 0.19 to 0.76 mSvy−1. Whereas the excess lifetime cancer risk (ELCR) UiTM Jengka was found to vary from 0.07 to 0.29%. A building that represented residential, college, classroom, office, and laboratory being below the permissible limit for average indoor radon concentration is about 48 Bqm−3, the world’s average annual effective was 3–10 mSvy−1 and ELCR limit is 1.3%, respectively. The results indicated that radiological risk is due to radon in this study area is considered safe.KeywordsCancer riskCR-39JengkaRadon

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