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Natural Radioactivity Levels and Radiological Risk Assessment of Surface Water of Wetland Tanguar Haor, Sunamganj District, Bangladesh |
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PP: 117-125 |
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Author(s) |
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M.A. Hossain Bhuiyan,
K. Asaduzzaman,
A. Kowser,
S.A.M. Shariar Islam,
M.R. Islam,
S.A. Kakoly,
M. Begum,
M. Khondker,
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Abstract |
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| The water has an importance in environmental studies because of its daily usage by human and its ability to transport pollutants, such as radionuclides that can pose a health risk to human. In the present investigation, the radioactivity in the surface water of wetlands Tanguar haor (two study stations, namely Ruar station and Watch tower station), Sunamganj, Bangladesh was carried out. The Tanguar Haor of Sunamganj bears a value since it has been declared as a Ramsar Site. The Study is made of the presence of the natural-series indicator radionuclides 226Ra (238U) and 228Ra (232Th) and the non-series radionuclide 40K, the gamma radiation exposure also being evaluated. Measurement was made employing gamma-ray spectroscopy system using High Purity Germanium (HPGe) detector and the radioactivity concentrations of 226Ra (238U), 228Ra (232Th) and 40K in surface water of both study stations ranged from 0.52±0.33 to 10.36 ± 0.21 Bql-1, 1.02±0.19 to 5.18 ± 0.55 Bql-1 and 8.21±1.59 to 84.8 ± 1.60 Bql-1, respectively. Comparatively higher level of radioactivity was noticed in March, April, July, September, and December of the year. No linear pattern of changes of radioactivity with physicochemical parameters was observed in haor surface water. The annual effective dose (3.25 to 12.60 μSv y−1) caused by the haor surface water was well below the upper dose criterion limit of 1 mSvy-1. Hence, yet pose no significant threat to the ecosystem, public health, and aquatic lives. |
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