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Determination of Gross Alpha/Gross Beta Radioactivity in Surface Water Collected from Various Geographical Points in Dhaka City |
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PP: 51-58 |
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doi:10.18576/jrna/070308
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Author(s) |
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M. F. Kabir,
N. Sultana,
S. Pervin,
M. Siraz,
S. Yeasmin,
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Abstract |
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| Radioactivity in surface water has become a severe matter of health concern worldwide. Gross Alpha and Beta calculation is a test performed to determine the overall radioactivity in water. Gross Alpha/Beta testing detects these alpha and Beta particles in the water and indicates the presence of radioactive substances. These studies have been measured in 23 surface water samples collected from different areas of Shahbag and Ramana thana, situated at the central point of Dhaka city. The measured dose rates due to natural radionuclides ranged from 0.09 µSvh-1 to 0.227 µSvh-1, and the average dose rate was calculated to likely 0.130435±0.019183 µSvh-1. pH is an essential parameter of water because there is a strong correlation between several water properties and this value. The pH value of collected surface water was found from 6.7 to 7.5 on the standard pH scale, and the average pH value was around 7.1±0.287623. The ZnS scintillation detector was used to determine the amount of gross alpha and gross beta activity in the dry residue of surface water samples. The gross alpha activity of our collected surface water sample ranged from 7.987 mBq/L to 28.179 mBq/L, and the mean Alpha activity of samples was calculated at about 18.19661±5.357773 mBq/L. The highest beta activity was observed at 120.864 mBq/L, and the lowest activity was 57.329 mBq/L. The average Beta activity of samples was calculated at 93.90048±17.54712 mBq/L .Moreover; there was no registered exceeding of the maximum allowed limits for gross alpha activity stipulated in the national and international legislation. The values obtained in this study were compared with those presented in similar studies from Bangladesh and other world regions. The purpose of this study was to provide a more straightforward approach for quantifying the radioactive contamination in surface water and to offer a scientific basis for making decisions regarding the management of radioactive pollution. In addition, the results of this study will contribute to the preparation of data for the national Survey on the gross alpha radioactivity in surface water samples. These data will serve as a reference for comparing the various levels of radioactivity. |
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