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The aim of this study is to determine the occupational hazards due to exposure to gamma radiations from oil and gas facilities. In-situ measurement of radiation exposure rate of some Oil Field Facilities in Rivers State, Nigeria carried out using Digilert 200 and Radalert 100 nuclear radiation monitor and a geographical positioning system (Garmin GPSMAP 76S). The average exposure rates of the facilities range from 0.010±0.002 to 0.015±0.001, for indoor and 0.014±0.003 to 0.027±0.003 for outdoor. The mean absorbed dose rates for indoor varied from 92.1 to 121.1 nGyh-1 while the mean outdoor absorbed dose varied from 120.4 to 234.2 nGyh-1. The estimated indoor annual effective dose varied from 0.14 to 0.19 mSvy-1 while the outdoor annual effective dose varied from 0.23 to 0.36 m Svy-1.The estimated indoor excess lifetime cancer risk (ELCR) range from 0.56× to 0.65x10-3 and outdoor ranged from 0.65×5 to 1.26×. The respective mean values of absorbed dose, AEDE and ELCR for indoor and outdoor measurements at the different locations exceeded the world permissible values of 60, 70 and 0.29× respectively. The result of this work indicated that used oilfield pipe market recorded the highest exposure rate. This could be due to radiations from scales on the pipes and may pose health challenged for long term exposure.
UK Offshore Operators Association Limited. Guidelines for operators on naturally occurring radioactive substances on offshore installations, UKOOA, London and Aberdeen; 1985.
American Petroleum Institute. Bulletin on Management of Naturally Occurring Radioactive Materials (NORM) in Oil and Gas Production, API Bull. E2, Washington, DC, Section 1.2;1992.
Escott P. The occurrence of radioactive contamination on offshore installations. NRPB report for the Department of Energy London; 1984.
International Association of Oil & Gas Producers. Guidelines for management of Naturally Occurring Radioactive Materials (NORM) in the oil and gas industry, Report No. 412, OGP Publication; 2008.
AL Nabhani K, Khan F, Yang M. Technologically enhanced naturally occurring radioactive materials in oil and gas production: A silent killer, Process Safety and Environmental Protection. 2016;99:237–247
Azionu CK, Avwiri OG, Ononugbo PC. Occupational hazards from BIR in selected crude oil production pipes storage locations in Niger Delta Region of Nigeria, Current Journal of Applied Science and Technology. 2019;37(2):1-12.
Avwiri GO, Ononugbo CP. Assessment of the Naturally Occurring Radioactive Material (NORM) content of hydrocarbon exploration and production activities in Ogba/Egbema/ Ndoni oil/gas field, Rivers State, Nigeria. Proceedings of the 1st International Technology, Education and Environment Conference African Society for Scientific Research (ASSR). 2011;572–580
Carter D. Petroleum geology of Nigeria, Schlumberger. 2005;26-32.
Nolen JL. Territorial Waters (International Law). Encyclopedia Britannica Inc; 2019.
Ononugbo CP, Avwiri GO, Chad-Umoren YE. Impact of gas exploitation on the environmental radioactivity of Ogba/ Egbema/Ndoni area, Nigeria. Environment & Energy. Multi-Science Publishing Co. Ltd., United Kingdom. 2011;22(8):201
Anekwe UL, Avwiri GO, Abumere OE. Evaluation of the gross alpha and beta radionuclide activity within some selected oil producing fields in rivers state, Nigeria, American Journal of Scientific and Industrial Research. 2013;4 (6):546-554.