International Research Journal of Public and Environmental Health

Original Research Article

Measurements of radon and estimation of excess lifetime cancer risk in water-well samples along Iwaraja-Ifewara faults Southwestern, Nigeria

G. Oluwaseun Dosunmu*1, Augustine Kolapo Ademola2, Pauline A. Jidele3, Kayode F. Ajayi4 and Inioluwa O Olowofila5

1Department of Physics, Federal University of Agriculture, Abeokuta, Nigeria.
2Department of Physics, Bells University of Technology, Ota, Ogun State, Nigeria.
3Department of Physics, Augustine University, Ilara-Epe, Lagos State, Nigeria.
4Distance learning Institute, University of Lagos, Akoka, Nigeria.
5Department of Science Laboratory Technology,The Federal Polytechnic Ilar,Nigeria.

*Corresponding Author E-mail: dosunmusg(at)

G. Oluwaseun Dosunmu

Augustine Kolapo Ademola

Pauline A. Jidele

Kayode F. Ajayi

Inioluwa O Olowofila

Article Number: irjpeh.22.015  |   Pages: 120-124  |   Vol. 9 (4), August 2022   |   DOI:

 Received: May 23, 2022  Accepted: July 11, 2022  Published: August 8, 2022


Health risks of Radon in water is a global concern. Radon is the major radioactive carcinogen in water causing lung cancer among non-smokers. The concentration of Radon in water depends on the geological nature of the zone. In this study, drinking water sourced from underground water wells in selected towns in southwestern, Nigeria, along the Iwaraja-Ifewara geological fault-line were sampled. Twenty (20) water samples were collected within 50 m to 150 m at the fault line. RAD-7 was used for Radon concentration measurement. Radiation doses due to ingestion and inhalation of Radon were determined and excess cancer risk were determined. The Radon concentration ranges 5.0 to 400.1 Bq/l with a mean value of 45.78±85.93 Bq/l. Radon concentration obtained is higher than US EPA recommended limit of 11.1 Bq/l in 70% of the samples. The mean value of total annual effective doses obtained was 59.4 µSv/y, which is below the US EPA recommended level of 100 µSv/y. The excess lifetime cancer risk (ECLR) due to inhalation from the water samples ranged from 75.6 to 6053.5 with a mean of 692.9, which is also below the recommended limit. Therefore, water samples from the study areas are safe for drinking.


Radon, element, concentration, health risks, geological fault

How to Cite this Article

Dosunmu GO, Ademola AK, Jidele PA, Ajayi KF Olowofila IO(2022).Measurements of radon and estimation of excess lifetime cancer risk in water-well samples along Iwaraja-Ifewara faults Southwestern, Nigeria. Int. Res. J. Pub Environ. Health

© 2022 The authors.
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