Browsing by Author "Dewan, Md. Jafor"

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A pioneering study of the radiological mapping in the world's largest mangrove forest (the Sundarbans) and implications for the public and environment
(Scopus, 2024-04-30) Mahmud, Jubair Al; Siraz, M.M. Mahfuz; Alam, M.S.; Dewan, Md. Jafor; Rashid, Md. Bazlar; Khandaker, Mayeen Uddin; Osman, Hamid; Tamam, Nissren
Coastal Mangroves are facing growing threats due to the harmful consequences of human activities. This first-ever detailed study of natural radioactivity in soil samples collected from seven tourist destinations within the Sundarbans, the world's largest mangrove forest, was conducted using HPGe gamma-ray spectrometry. Although the activity levels of 226Ra (11 ± 1–44 ± 4 Bq/kg) and 232Th (13 ± 1 68 ± 6 Bq/kg) generally align with global averages, the concentration of 40K (250 ± 20–630 ± 55 Bq/kg) was observed to surpass the worldwide average primarily due to factors like salinity intrusion, fertilizer application, agricultural runoff, which suggests the potential existence of potassium-rich mineral resources near the study sites. The assessment of the hazard parameters indicates that the majority of these parameters are within the recommended limits. The soil samples do not pose a significant radiological risk to the nearby population. The results of this study can establish important radiological baseline data before the Rooppur Nuclear Power Plant begins operating in Bangladesh.
Radiation dose assessment: Establishment of local diagnostic reference levels for selected radiography examinations across three prominent hospitals in Sudan
(Scopus, 2023-03-16) Siraz, M. M. Mahfuz; Dewan, Md. Jafor; Chowdhury, Md. I. A.; Mahmudb, Jubair Al; Alamb, M. S.; Rashid, Md. Bazlar
This research assesses radioactivity in soil and coal samples around the Barapukuria coal-fired thermal power plant using a high-purity germanium detector. The range of activity of 226Ra, 232Th, and 40K in the studied soil samples were 14–75, 16–112, and 132–460 Bqkg−1, respectively and the respective activity in coal samples ranged from 14–30, 16–39 and 72–182 Bqkg−1. The majority of the hazard indices (absorbed dose rate, gamma index, effective dose and excess lifetime cancer risk) were higher than the world average, which shows that long-term exposure to terrestrial ionising radiation is not safe for coal miners and the local community. The presence of minerals like monazite and zircon, granitic type parent rock, bottom ash discharged adjacent on lowlands, fly ash deposition, different geochemical and physicochemical properties, dominant wind directions, the artificial contamination, meteorological conditions, leaching caused by rainwater- may have a crucial influence on NORM distributions. The quantitative results of this study have important implications for planning a larger and more modern coal-fired power plant, and this study’s findings inspire municipal officials to restrict and monitor the release of fly ash nearby coal-fired power plants. In addition, it is essential to monitor the health of individuals (workers and locals) near the power plant.
Radioactivity in Soil and Coal Samples Collected From the Vicinity of the Coal-Fired Thermal Power Plant and Evaluation of the Associated Hazard Parameters
(Taylor & Francis Group, 2023-03-29) Siraz, M. M. Mahfuz; Dewan, Md. Jafor; Chowdhury, Md. I. A.; Al Mahmud, Jubair; Alam, M. S.; Rashid, Md. Bazlar
This research assesses radioactivity in soil and coal samples around the Barapukuria coal-fired thermal power plant using a high-purity germanium detector. The range of activity of 226Ra, 232Th, and 40K in the studied soil samples were 14–75, 16–112, and 132–460 Bqkg−1, respectively and the respective activity in coal samples ranged from 14–30, 16–39 and 72–182 Bqkg−1. The majority of the hazard indices (absorbed dose rate, gamma index, effective dose and excess lifetime cancer risk) were higher than the world average, which shows that long-term exposure to terrestrial ionising radiation is not safe for coal miners and the local community. The presence of minerals like monazite and zircon, granitic type parent rock, bottom ash discharged adjacent on lowlands, fly ash deposition, different geochemical and physicochemical properties, dominant wind directions, the artificial contamination, meteorological conditions, leaching caused by rainwater- may have a crucial influence on NORM distributions. The quantitative results of this study have important implications for planning a larger and more modern coal-fired power plant, and this study’s findings inspire municipal officials to restrict and monitor the release of fly ash nearby coal-fired power plants. In addition, it is essential to monitor the health of individuals (workers and locals) near the power plant.
Vertical distributions of radionuclides along the tourist-attractive Marayon Tong Hill in the Bandarban district of Bangladesh
(Daffodil International University, 2023-02-10) Siraz, M. M. Mahfuz; Roy, Debasish; Dewan, Md. Jafor; Alam, M. S.; Jubair A. M.; Rashid, Md. Bazlar; Khandaker, Mayeen Uddin; Bradle, D. A.; Yeasmin, S.
This is the first attempt in the world to depict the vertical distribution of radionuclides in the soil samples along several heights (900 feet, 1550 feet, and 1650 feet) of Marayon Tong hill in the Chittagong Hill Tracts, Bandarban by HPGe gamma-ray spectrometry. The average activity concentrations of 232Th, 226Ra, and 40K were found to be 37.15 ± 3.76 Bqkg−1, 19.69 ± 2.15 Bqkg−1, and 347.82 ± 24.50 Bqkg−1, respectively, where in most cases, 232Th exceeded the world average value of 30 Bqkg−1. According to soil characterization, soils ranged from slightly acidic to moderately acidic, with low soluble salts. The radium equivalent activity, outdoor and indoor absorbed dose rate, external and internal hazard indices, external and internal effective dose rates, gamma level index, and excess lifetime cancer risk were evaluated and found to be below the recommended or world average values; but a measurable activity of 137Cs was found at soils collected from ground level and at an altitude of 1550 feet, which possibly arises from the nuclear fallout. The evaluation of cumulative radiation doses to the inhabitants via periodic measurement is recommended due to the elevated levels of 232Th.This pioneering work in mapping the vertical distribution of naturally occurring radioactive materials (NORMs) can be an essential factual baseline data for the scientific community that may be used to evaluate the variation in NORMs in the future, especially after the commissioning of the Rooppur Nuclear Power Plant in Bangladesh in 2024.