Analysis of Indoor Radon Level and its Health Risks Parameters in Three Selected Towns in Port Harcourt, Rivers State, Nigeria

Orlunta Aloysius Ndubisi; Margaret Apaem Briggs-Kamara; Friday Barikpe Sigalo; Tamunobereton-Ari Iyeneomie

doi:10.46481/jnsps.2021.203

Authors

Orlunta, Aloysius Ndubisi
[email protected]
Department of Physics, Faculty of Science, Rivers State University, Nkpolu Oroworukwo, Port Harcourt, Rivers State, Nigeria
Briggs-Kamara, Margaret Apaem Department of Physics, Faculty of Science, Rivers State University, Nkpolu Oroworukwo, Port Harcourt, Rivers State, Nigeria
Sigalo, Friday Barikpe Department of Physics, Faculty of Science, Rivers State University, Nkpolu Oroworukwo, Port Harcourt, Rivers State, Nigeria
Iyeneomie, Tamunobereton-Ari Department of Physics, Faculty of Science, Rivers State University, Nkpolu Oroworukwo, Port Harcourt, Rivers State, Nigeria

Keywords:

indoor radon, annual absorbed dose, annual effective dose, excess life cancer risk

Abstract

Analysis of indoor radon level and its health risk parameters has been carried out in Borikiri (BT), Diobu (DR), and Rebisi (RB) towns in Port Harcourt, Rivers State, Nigeria. A pocket sized Corentium Arthings digital radon detector meter was used to record the indoor radon concentration levels. The geographical coordinates were recorded using a hand-held geographical positioning system (GPS) for the various sample points. A total of ten houses were measured for each town making a total of 30 sample points for the three communities. The results obtained show that for Borikiri town, the concentration level varied from 30.7100 - 19.9800 Bqm-3 with an average of 11.32 ± 2.59 Bqm-3 . The annual absorbed dose varied from 7.7478 - 1.1202 mSv/yr with a mean value of 2.59 ± 0.65 mSv/yr while the annual equivalent dose rate varied from 0.829 - 0.336 mSv/yr with an average of 0.69 ± 0.16 mSv/yr The excess life time cancer risk calculated for seventy years (70yrs) varied from 6.510 - 0.941 with an average of 2.45 ± 1.71. The results of the indoor concentration level for Diobu town ranged from 37.74 - 5.9200 Bqm ?3 with a mean value of 12.95 ± 2.91 Bqm-3 . The annual absorbed dose for the area ranged from 9.5214 - 1.1494 with an average of 3.26 ± 0.73 mSv/yr, the annual equivalent dose rate varied from 0.694-0.359 with a mean of 0.78±0.8, the excess life time cancer risk calculated for seventy years ranged from 8.000-1.725 with a mean of 2.91±0.61. The indoor concentration level for Rebisi town ranged from 12.9500?4.0700 Bqm-3 with an average of 8.55 ± 1.00, the annual absorbed dose ranged from 3.2671 - 1.0268 mSv/yr, the annual equivalent dose rate varied from 0.784 - 0.269 with an average of 0.52 ± 0.06, the excess life time cancer risk of 2.745 - 0.863 with an average of 1.82 ± 0.21. The results of the indoor concentration levels, the annual absorbed dose and the annual effective dose rate are all below the ICRP safe limit. However, the results of the excess life time cancer risk are all higher than the ICRP safe standard limit of 0.029 × 10-3 .

Dimensions

REFERENCES

T.J Ojo and I. Ajayi, Outdoor Radon Concentration in the Township of Ado- Ekiti Nigeria, Journal of Atmospheric Pollution 3 (2015) 21.

IARC CD-ROM, Globocan 1: Cancer Incidence and Mortality Worldwide in 1990, Lyon, International Atomic Energy Agency Press (1998).

WHO. WHO Handbook on indoor radon: A public health perspective World Health Organization, Geneva, (2009).

WHO Handbook on Indoor Radon World Health Organisation (2009).

UNSCEAR Effects and risks of ionizing radiations. New York: United Nations Scientific Committee on the Effects of Atomic Radiation (2000).

NCRP (U.S. National Council on Radiation Protection and Measurement), ”Measurement of Radon and Radon Daughters in air”, NCRP Report No97, ISBN 0-913392-97-9, Bethesda (1988).

ICRP Protection against Radon-222 at Home and at Work, International Commission on Radiological Protection Publication 65: Ann Icrp 23 (1993).

UNSCEAR, Sources and Effects of Ionizing Radiation, United Nations Scientific Committee on the Effects of Atomic Radiation (1993).

A.W.K. Yeun, The As Low As Reasonably Achievable (ALARA) principle: a brief historical overview and a bibliometric analysis of the most cited publications Radioprotection (2019).

W. S. Kent, and S. E. William Geochemical and Ray Characterization of Pennsylvanian Black Shales: Implications for Elevated Home Radon Levels in Vanderburgh County, Indiana, Journal of Environmental Radioactivity 148 (2015) 162.

UNSCEAR. Sources and Effects of Ionizing Radiation. Volume II: Effects. UNSCEAR (2000) Report. United Nations Scientific Committee on the Effects of Atomic Radiation, Report to the General Assembly, with scientific annexes. United Nations sales publication E.00.IX.4. United Nations, New York, (2000).

ICRP Recommendations of the International Commission on Radiological Protection ICRP Publication 60 Ann. Icrp 21 (1991) 3.

ICRP Lung Cancer Risk from Radon and Progeny, statement on Radon International Commission on radiological Protection Publication 115. Annal ICRP 40 (2010).

M. R. Usikalu, C. A. Onumejor, J. A. Achuka, A. Akinpelu, M. Omeje and T. A. Adagunodo Monitoring of radon concentration for different building types in Covenant University, Nigeria, Cogent Engineering 7 (2020) 1759396

S. A. Sokari, “Estimation of Radiation Risks Associated with Radon within Residential Buildings in Okrika, Rivers State, Nigeria”, Asian Journal of Physical and Chemical Sciences 6 (2018) 1.

O. T. Afolabi, T.E. Deborah, B. Bosun, A. F Benjamin., E. T. James and B. O. Babakayode Radon level in a Nigerian University Campus . BMC Res Notes 8 (2015) 677

S. A. Sokari, Estimation of Radiation Risks Associated with Radon within Residential Buildings in Okrika, Rivers State, Nigeria, Asian Journal of Physical and Chemical Sciences 6 (2018) 12.