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Assessment of Background Radiation Level and The Dose to Organs of Some Selected Office Buildings in FCT Abuja, Nigeria |
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PP: 21-26 |
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doi:10.18576/jrna/100104
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Author(s) |
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Ibrahim Fatima Iliya,
Andah Mamman,
Daret Jane Timothy,
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Abstract |
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| In this study, the background exposure levels of some selected office buildings in FCT Abuja Nigeria were investigated. An in-situ background radiation level for twenty (20) office buildings in FCT Abuja was carried out using a calibrated portable Geiger Muller (GM) detector placed 1 m above the ground level. The geographical location of each sampling point was recorded using a Global Positioning System (GPS). The radiological hazards indices and radiation effective doses to different body organs were evaluated using the measured background radiation level. The obtained values of radiological hazard parameters were compared with recommended standards set by the International Commission on Radiological Protection (ICRP) and the United Nations Scientific Committee on the Effect of Atomic Radiation (UNSCEAR) for hazard evaluation. The mean values of the outdoor background exposure levels (0.090 mRh-1), absorbed dose rates (788.6 nGyh-1), and excess lifetime cancer risk (3.53852 × 10-3) are higher than the recommended safe limits of 0.0130 mRh-1, 84.000 nGyh-1, 0.29×10-3 respectively as recommended by UNSCEAR and ICRP. The mean annual effective dose equivalent (0.9672 mSvy-1) is within the recommended permissible limits of 1.00 mSvy-1 for general public exposure and the effective doses to different body organs are all below the recommended limits of 1.00 mSvy-1. The background exposure levels in some selected office buildings in FCT Abuja are safe and may pose no significant hazard to the occupant. |
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