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Home  >  Volume 25 (2013)

Evaluation of Gross Alpha and Beta Radioactivity in Underground Water Within Makurdi Metropolitan City by Akaagerger N. B., Tyovenda A. A. and Aiyohuyin E. O. Vol. 25 ( Nov. 2013). pp 187-190
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An evaluation of gross alpha and beta radioactivity in ground water in Makurdi Metropolis has been studied. In this work, samples were drawn at random from 12 underground water sources. The samples were drawn in two liters of plastic containers; 10ml of nitric acid was added to acidify the water and preserve most trace metals and minimize absorption on the walls of the container. The samples were evaporated to dryness at room temperature and the residue transferred into planchett. They were then counted for gross alpha and beta radioactivity in one-channel gas filled proportional counter. The detector was characterized for background limit. Results obtained from the analysis shows that the alpha activity in the samples ranges from 0.15 ± 0.03 BqL-1 to 0.68± 0.06 BqL-1 and the beta activity ranges from 0.37 ± 0.03 BqL-1 to 1.22 ± 0.04 BqL-1. The results show that the maximum alpha activity of 0.68± 0.06 BqL-1 is slightly above the acceptable screening radioactivity level of 0.5 BqL-1 set by International commission on Radiological Protection and World Health Organization. Also the maximum measured beta activity of 1.22 ± 0.04 BqL-1 is above the safety limit of 1 BqL-1 set by International commission on Radiological Protection and World Health Organization. We do recommend that for drinking purpose, it will be safer to treat some of the underground drinking water using reverse osmosis in order to reduce the activity levels.

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