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Gross Alpha and Beta Activity Concentrations and Annual Effective Doses due to Intake of Bangladeshi market Tea |
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PP: 7-13 |
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doi:10.18576/jrna/070302
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Author(s) |
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Jannatul Ferdous,
Md. Ashraful Islam,
Rumy Parvez,
Zakir Hossain,
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Abstract |
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| Bangladesh is an important tea-producing country. It is the 10th largest tea producer in the world. A wide-ranging study was planned and carried out to analysed gross alpha and beta activity concentrations and evaluate the annual effective dose equivalent. Total nineteen Black and green tea samples of different brand were collected from local market of Dhaka city in and analysed by ZnS (Ag) scintillation detector counting namely Low Background Gross Alpha/Beta Counting System. The Measured activity concentrations ranging from 2.11±0.035 mBql-1 to 6.90±0.048 mBql-1 for the gross α and 47.96±0.35 mBql-1 to 124±0.99 mBql-1 for gross β were observed in branded tea samples, respectively. The gross α and total β activity concentrations for all tea samples are lower than WHOs recommended level and the Environment Conservation Rules, 1997 of Bangladesh. The obtained result showed that the annual effective dose equivalent from alpha and beta emitters did not exceed WHO recommended reference level for alpha and beta annual dose in food and drinking samples. The pH values in infusion black tea and green tea samples ranged from 4.87±0.02 to 5.93±0.02 and 6.51±0.03 to 6.78±0.02. This research work could help to create a public awareness about the total or gross alpha and beta activities in tea samples and the radiological impact on the public health. |
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