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IJSTR >> Volume 3- Issue 4, April 2014 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Assessment Of Environmental Radioactivity In Selected Dumpsites In Port Harcourt, Rivers State, Nigeria

[Full Text]



Avwiri, G.O., Olatubosun, S.A.



Keywords: Absorbed Dose, Effective Dose, Gamma Spectrometry, Radioactivity, Specific Activity.



Abstract: Radionuclide concentration of soil samples from selected dumpsites within Port Harcourt, Rivers State, Nigeria was determined. In-situ measurements were carried out using Radalert Nuclear Radiation Monitor and a Geographical Positioning System (GPS). Two soil samples each from ten selected dumpsites were collected. Gamma Ray Spectrometry analysis was carried out on the samples to determine specific activity using NaI(Tl) scintillation detector. The measured in-situ equivalent dose rate ranged from 0.891 mSv/yr to 1.592 mSv/yr with an average of 1.261±0.693 mSv/yr for all the locations with seven locations having values below the internationally permissible threshold. The activity concentration of the soil samples obtained through gamma spectrometry analysis ranged from 32.21 Bq/Kg to 100.10 Bq/kg for 232Th, 29.16 Bq/Kg to 61.18 Bq/Kg for 238U and 222.15 Bq/Kg to 1166.99 Bq/Kg for 40K with an average of 62.61±18.97 Bq/Kg, 41.96±5.53 Bq/Kg and 643.10±5.94 Bq/Kg for 232Th, 238U and 40K respectively. Air absorbed dose rate calculated ranged from 57.05 nGy/hr to 123.10 nGy/hr with an average value of 86.71±12.86 nGy/hr for the locations which is higher than the world-average value of 55 nGy/hr for soil. The equivalent radiation exposure obtained using the radionuclide concentration for the locations is between 0.50 mSv/yr and 1.08 mSv/yr with an average of 0.76±0.11 mSv/yr which is below the permissible threshold of 1.0 mSv/yr for soil. Generally, the radiation burden and associated risk posed by the municipal wastes on the studied environment and scavengers is minimal.



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