Abstract
A total forty two (42) sampled points were investigated for radioactivity level and health implication using standard method. The exposure dose rate ranged from 14 to 32μRh-1 with an average value of μ23Rh-1. Dose rate and equivalent dose rate ranged from 121.8 to 278.4nGyh-1 and 1.18 to 2.69mSvy-1 respectively. The average value of the indoor annual effective dose equivalent (AEDE), outdoor AEDE, and excess lifetime cancer risk (ELCR) were computed to be 0.936 mSvy-1, 0.311 mSvy-1 and 0.810 x 10-3 respectively. Analysis of dose to human organs; testes and ovaries, were 0.61 and 0.43 mSvy-1 respectively. Exposure rate, dose rate and ELCR exceeded the recommended values. All the outdoor AEDEs were within the permissible value of 1.0 mSvy-1 for general public and below the limit of 20 mSvy-1 for radiological workers as recommended by InternationalCommission on Radiation Protection (ICRP).
 Keywords: Assessment, Environmental radioactivity, Exposure dose, Health impact
Highlights
The community is one of the semi urban communities situated in Ogbia Local Government Area of Bayelsa State in the Niger Delta region of southern part of Nigeria
Imiringi hosts a number of oil and gas facilities which include but not limited to forty-six (46) oil wells, five planning sites, manifold flow station, field logistic base etc
Results of the background ionizing radiation at different sampled points with corresponding computed hazard indices for Imiringi community are presented in Tables 1 and 2
Summary
Ionizing Radiation (BIR) Exposure Levels: The results of average background ionizing radiation were considered based on the forty two sample points in the seven sections of the community. At Field logistic site area (FLS) the average BIR ranged from 16μRh-1 to 23μRh-1. Around the Main bridge area (MBR) it ranged from 21 to 32 μRh-1. In Ring and seminary road area (RNR) it ranged from 14 to 23 μRh-1. At the gas flow area (GFL) it ranged from 18 to 23 μRh-1. Within the Shell petroleum site (SPD) it ranged from 20 to 27 μRh-1. At Otopiri oil well area (OTW) it ranged from 24 to 32 μRh-1
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