Gross Alpha and Gross Beta Activities of Tap Water Samples from Different Locations of Dhaka City

Sri Lankan Journal of Physics Pub Date : 2012-07-19 DOI:10.4038/SLJP.V13I1.3917

M. Ferdous, M. Rahman, A. Begum

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引用次数: 18

Abstract

Gross alpha and gross beta activities were determined for twenty tap water samples collected from different locations in Dhaka city. The instrumentations used to count the gross alpha and gross beta activities were ZnS scintillation detector and gas proportional counter, respectively. Concentrations ranging from 1.88 ± 0.03 mBq / l to 8.16 ± 0.03 mBq / l with an average 3.76 ± 1.50 mBq / l and from 29.305 ± 0.06 mBq/ l to 115.74 ± 0.16 mBq / l with an average 60.41 ± 23.57 mBq /l were observed for the gross alpha and gross beta activities, respectively. The results showed that the natural activities of alpha and beta emitting radionuclides in tap water samples did not exceed WHO recommended levels and were comparable with the data available in other parts of the world. It suggests that the radioactivity in tap water for the people residing in Dhaka city is not yet a problem. To ensure the safe level of radioactivity in drinking water, however, periodic monitoring of water quality for compliance is necessary. DOI: http://dx.doi.org/10.4038/sljp.v13i1.3917 Keywords: Gross Alpha; Gross beta; Tap water; ZnS Scintillation Counter and Gas Proportional Counter Sri Lankan Journal of Physics, Vol. 13(1) (2012) 01-08

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达喀市不同地点自来水样本的总α和总β活性

测定了从达卡市不同地点收集的20个自来水样品的总α和总β活性。测定总α活度和总β活度的仪器分别是ZnS闪烁检测器和气体比例计数器。总α和总β活性的浓度范围分别为1.88±0.03 mBq/ l ~ 8.16±0.03 mBq/ l，平均为3.76±1.50 mBq/ l和29.305±0.06 mBq/ l ~ 115.74±0.16 mBq/ l，平均为60.41±23.57 mBq/ l。结果表明，自来水样品中释放α和β的放射性核素的自然活性没有超过世卫组织建议的水平，并与世界其他地区的现有数据相当。这表明，对居住在达卡市的人们来说，自来水中的放射性还不是一个问题。然而，为了确保饮用水中的放射性达到安全水平，必须定期监测水质是否符合规定。关键词:Gross Alpha;总β;自来水;ZnS闪烁计数器与气体比例计数器斯里兰卡物理学报Vol. 13(1) (2012) 01-08

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Sri Lankan Journal of Physics

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