Browsing by Author "Rashid, Md Bazlar"

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    Assessment of Radionuclides From Coal-Fired Brick Kilns on the Outskirts of Dhaka City and the Consequent Hazards on Human Health and the Environment
    (Elsevier, 2023-05-05) Siraz, M.M. Mahfuz; Rakib, M.D.A.; Alam, M.S.; Mahmud, Jubair Al; Rashid, Md Bazlar; Khandaker, Mayeen Uddin; Islam, Md. Shafiqul; Yeasmin, S.
    In a first-of-its-kind study, terrestrial radionuclide concentrations were measured in 35 topsoil samples from the outskirts of Dhaka using HPGe gamma-ray spectrometry to assess the radiological consequences of such a vast number of brick kilns on the plant workers, general as well as dwelling environment. The range of activity concentrations of 226Ra, 232Th, and 40K is found at 19 ± 3.04 to 38 ± 4.94, 39 ± 5.85 to 57 ± 7.41, and (430 ± 51.60 to 570 ± 68.40) Bq/kg, respectively. 232Th and 40K concentrations were higher than the global averages. Bottom ash deposition in lowlands, fly ash buildup in soils, and the fallout of micro-particles are all probable causes of the elevated radioactivity levels. 137Cs was found in the sample, which indicates the migration of 137Cs from nuclear accidents or nuclear fallout, or the contamination of feed coal. Although the effective dose received by the general public was below the recommended dose limit but, most estimates of hazard parameters surpass their respective population weighted global averages, indicating that brick kiln workers and nearby residents are not safe due to prolonged exposures to terrestrial radiation. In addition, the soil around sampling sites is found to be unsuitable for agricultural purposes.
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    Evaluation of Radioactivity in Soil and Rock Samples From an Undiscovered Sea Beach in the Southeastern Coastline of Bangladesh and Associated Health Risk
    (Springer, 2023-08-10) Siraz, M.M. Mahfuz; Kamal, Md Hossain; Khan, Zulfiqar Hasan; Alam, M. S.; Mahmud, Jubair Al; Rashid, Md Bazlar; Khandaker, Mayeen Uddin; Osman, Hamid; Yeasmin, S.
    This study marks the first-ever assessment of radiological hazards linked to the sands and rocks of Patuartek Sea Beach, situated along one of the world's longest sea beaches in Cox' Bazar of Bangladesh. Through the utilization of an HPGe detector, a comprehensive analysis of the activity concentrations of 226Ra, 232Th, and 40 K was conducted, and their activity ranged from 7 to 23 Bq/kg, 9-58 Bq/kg, and 172-340 Bq/kg, respectively, in soils, and 19-24 Bq/kg, 27-39 Bq/kg, and 340-410 Bq/kg, respectively, in rocks. Some sand samples exhibited elevated levels of 232Th, while the rock samples displayed higher levels of 40 K compared to the global average. The radiological hazard parameters were assessed, and no values surpassed the recommended limits set by several international organizations. Hence, the sands and rocks of Patuartek sea beach pose no significant radiological risk to the residents or tourists. The findings of this study provide crucial insights for the development of a radiological baseline map in the country, which is important due to the commissioning of the country's first nuclear power plant Rooppur Nuclear Power Plant. The data may also stimulate interest in the rare-earth minerals present in the area, which is important for the electronics industry, thorium-based nuclear fuel cycles.