Assessment of Background Radiation in Ojota Chemical Market, Lagos, Nigeria

Usikalu, M.R. and Morakinyo, R. O. and Orosun, Muyiwa Michael and Achuka, J.A (2023) Assessment of Background Radiation in Ojota Chemical Market, Lagos, Nigeria. Journal of Hazardous, Toxic, and Radioactive Waste, 27 (1). 04022041.

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Abstract

The monitoring of radiation levels in human-inhabited environments is imperative to avoid public exposure. The activity concentration of primordial radionuclides at Ojota Chemical Market was measured to determine the in situ activity of 238U, 232Th, and 40K in ambient air using an RS-125 Super SPEC gamma spectrometry with global positioning system. The measured absorbed dose rates ranged from 28.35 to 106.55 nGy/h, giving an average value of 70.46 nGy/h. The estimated absorbed dose rate spanned from 22.25 to 101.03 nGy/h with a mean value of 65.50 nGy/h. The average concentrations of 40K, 238U, and 232Th were 458.55, 30.26, and 54.77 Bq/kg respectively. The outdoor and indoor absorbed doses averaged 80.39 and 132.55 μSv/y, respectively, and the mean value of excess lifetime cancer risk was 0.26 × 10−6 μSv/y. The external and internal hazard index averaged 0.39 and 0.47, respectively, and the mean annual gonadal dose equivalent was 465.14 μSv/y. The radium equivalent dose averaged 143.45 Bq/kg while the gamma representative index averaged 1.05. The absorbed dose rate, mean concentration of 40K and 232Th, the average values of excess lifetime cancer risk, the annual gonadal dose equivalent, and the gamma representative index were above the permissible limit as set by the radiation regulatory agencies. The study concluded that the human activities in Ojota Chemical Market might have increased the radiation burden of the community.

Item Type:	Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Engineering, Science and Mathematics > School of Physics
Depositing User:	ORIGBOEYEGHA
Date Deposited:	05 Aug 2024 13:07
Last Modified:	05 Aug 2024 13:07
URI:	http://eprints.covenantuniversity.edu.ng/id/eprint/18357

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