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Akamba Mbembe B, Manga A, Mbida Mbembe S, Ele Abiama P, Ondo Meye P, Kofane TC, Ben-Bolie GH. INDOOR RADON (222RN) MEASUREMENTS AND ESTIMATION OF ANNUAL EFFECTIVE DOSE IN MVANGAN LOCALITY, SOUTH CAMEROON. RADIATION PROTECTION DOSIMETRY 2022; 198:1565-1574. [PMID: 36274266 DOI: 10.1093/rpd/ncac204] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Revised: 08/13/2022] [Accepted: 08/16/2022] [Indexed: 06/16/2023]
Abstract
The present work was aimed at measuring indoor radon activity concentrations in dwellings in Mvangan locality, South Cameroon, in order to assess the extent of measures that may be necessary for controlling public indoor radon exposure in this area. Measurements were carried out using passive solid-state nuclear track detectors (RADONAVA Inc., RadTrak2, Sweden) following ISO 11665-4 standard. Radon concentration ranged between 36 ± 20 and 150 ± 30 Bq m-3 with arithmetic and geometric means values of 64 ± 25 and 60 ± 1 Bq m-3, respectively. These mean values were greater than worldwide values presented by United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR), which are, respectively, 40 and 30 Bq m-3. 96% of dwellings that have radon concentrations below the World Health Organization (WHO) reference level of 100 Bq m-3, whereas 4% of dwellings have radon concentrations higher than this level but lower than 300 Bq m-3, the International Commission on Radiological Protection (ICRP) reference level. Annual effective doses due to indoor radon ranged between 0.7 and 2.8 mSv y-1 with an arithmetic mean value of 1.2 ± 0.5 mSv y-1. These values were below the lower limit of the ICRP-recommended action level interval 3-10 mSv y-1. It has been observed that annual effective dose received by residents in cement bricks dwellings were not significantly different (P-value = 0.565) than those received by residents in mud dwellings in Mvangan locality. The mean number of persons expected to be diagnosed with or die from cancer (solid cancers and leukemia) were 162 ± 48 (61 ± 25 for males and 101 ± 41 for females) and 82 ± 24 (33 ± 13 for males and 49 ± 20 for females), respectively. The results obtained in this study prove that the populations of Mvangan locality are exposed to a relatively low potential risk of cancer incidence and mortality.
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Affiliation(s)
- Bertrand Akamba Mbembe
- Office of Regulatory and Technical activities, National Radiation Protection Agency, PO Box 33172, Yaoundé, Cameroon
- Department of Physics, University of Yaounde I, Faculty of Science, Nuclear Physics Laboratory, PO Box 1937, Yaoundé, Cameroon
| | - André Manga
- Nuclear Technology Section, Institute of Geological and Mining Research, PO Box 4110, Yaoundé, Cameroon
| | - Serge Mbida Mbembe
- Office of Regulatory and Technical activities, National Radiation Protection Agency, PO Box 33172, Yaoundé, Cameroon
- Department of Physics, University of Yaounde I, Faculty of Science, Nuclear Physics Laboratory, PO Box 1937, Yaoundé, Cameroon
| | - Patrice Ele Abiama
- Department of Physics, University of Yaounde I, Faculty of Science, Nuclear Physics Laboratory, PO Box 1937, Yaoundé, Cameroon
- Nuclear Technology Section, Institute of Geological and Mining Research, PO Box 4110, Yaoundé, Cameroon
| | - Philippe Ondo Meye
- Department of Physics, University of Yaounde I, Faculty of Science, Nuclear Physics Laboratory, PO Box 1937, Yaoundé, Cameroon
- Direction Generale de la Radioprotection et de la Surete Nucleaire, Ministere de l'Energie et des Ressources Hydrauliques, Libreville, Gabon
| | - Timoléon Crépin Kofane
- Department of Physics, University of Yaounde I, Faculty of Science, Nuclear Physics Laboratory, PO Box 1937, Yaoundé, Cameroon
| | - Germain Hubert Ben-Bolie
- Department of Physics, University of Yaounde I, Faculty of Science, Nuclear Physics Laboratory, PO Box 1937, Yaoundé, Cameroon
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Sherafat S, Nemati Mansour S, Mosaferi M, Aminisani N, Yousefi Z, Maleki S. First indoor radon mapping and assessment excess lifetime cancer risk in Iran. MethodsX 2019; 6:2205-2216. [PMID: 31667121 PMCID: PMC6812403 DOI: 10.1016/j.mex.2019.09.028] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Accepted: 09/21/2019] [Indexed: 12/18/2022] Open
Abstract
Radon (222Rn) is believed to be the main contributor to lung cancer second to smoking. The first national indoor radon map derived from some scattered regional radon surveys in Iran. The arithmetic mean of indoor radon concentration was calculated to 117.4 ± 97.7 Bq/m3. The mean excess life time cancer risk (ELCR) values were found to be in the range of 0.1%-4.26%, with an overall average value of 1.01%. The mean radon-induced lung cancer risk was 46.8 per million persons. Absence of sufficient indoor radon data showed that national wide monitoring programs should be activated in uncovered areas. Meanwhile, in order to provide further baseline values for radon mapping, we attempted to survey the radon levels inside 50 dwellings of Shabestar County in northwest of Iran. The investigation was also focused on the effects of some buildings related variables. The radon levels recorded varied from 3.92 to 520.12 Bq/m3, with a mean value of 56.19 ± 45.96 Bq/m3. In 9% of dwellings radon concentration exceeded 100 Bq/m3, the limit recommended by the World Health Organization. The average annual effective dose received by the residents of studied area was calculated to be 1.4 mSv. The ELCR was estimated to be 0.54%.
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Affiliation(s)
- Samira Sherafat
- Health Faculty, Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Sepideh Nemati Mansour
- Health Faculty, Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
- Health and Environment Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mohammad Mosaferi
- Health and Environment Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
- Tabriz Health Services Management Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Nayyereh Aminisani
- Noncommunicable Diseases Research Center, Neyshabur University of Medical Sciences, Neyshabur, Iran
| | - Zabihollah Yousefi
- Department of Environmental Health Engineering, Faculty of Health and Health Sciences Research Center, Mazandaran University of Medical Sciences, Sari, Iran
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Abdullahi S, Ismail AF, Samat S. Determination of indoor doses and excess lifetime cancer risks caused by building materials containing natural radionuclides in Malaysia. NUCLEAR ENGINEERING AND TECHNOLOGY 2019. [DOI: 10.1016/j.net.2018.09.017] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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