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Journal of Environmental Protection 2011年第10期2卷 1353-1359页

作者： Shawpan C. Sarkar Idris Ali debasish paul Mahbubur R. Bhuiyan Sheikh M. A. Islam 不详

The activity concentration of natural and fallout radionuclides in the soil at some selected Thanas around the TRIGA Mark-II Research Reactor at Atomic Energy Research Establishment (AERE), Savar, Dhaka were measured by using a high purity germanium detector (HPGe). The study revealed that only natural radionuclides were present in the samples and no trace of any artificial radionuclide was found. The average activity concentration of 238U, 232Th and 40K were found to be 37.8 ± 5.6 ***-1, 58.2 ± 11.0 ***-1 and 790.8 ± 153.4 ***-1 respectively. The radium equivalent activity (Req), absorbed dose rate (D), external radiation hazard index (Hex) and internal radiation hazard index (Hin) were also calculated to find out the probable radiological hazard of the natural radioactivity.

关键词： Natural Radionuclide Artificial Radionuclide HPGe Detector TRIGA Mark-II Research Reactor Activity Concentration

Study of Environmental Radiation on Sand and Soil Samples from Kuakata Sea Beach of Patuakhali

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Journal of Environmental Protection 2012年第9期3卷 1078-1084页

作者： Khondaker Mohammed Nazrul Islam debasish paul Md. Mahbubur Rahman Bhuiyan Amina Akter Budrun Neher Sheikh Mohammad Azharul Islam Department of Physics Comilla University Comilla Bangladesh Department of Physics Jahangirnagar University Savar Bangladesh Health Physics & Radioactive Waste Management Unit (HP & RWMU) Institute of Nuclear Science & Technology (INST) Atomic Energy Research Establishment (AERE) Savar Bangladesh

The activity concentrations of radionuclides in the sand and soil samples collected from Kuakata seabeach of Patuakhali district in Bangladesh have measured using a high resolution high purity germanium (HPGe) detector of relative efficiency 40%. The activity concentrations of 226Ra, 232Th and 40K were found in the sand samples of Kuakata seabeach varied from 2.82 ± 4.89 to 87.96 ± 4.45 ***–1, 21.72 ± 16.27 to 290.93 ± 18.15 ***–1 and 26.24 ± 0.35 to 852.05 ± 142.15 ***–1 respectively. For soil samples the activity concentrations of corresponding radionuclides were found to be 20.98 ± 3.96 to 42.92 ± 4.76 ***–1, 59.25 ± 15.62 to 144.34 ± 18.52 ***–1 and 570.43 ± 100.3 to 1165 ± 166.27 ***–1 respectively. The average absorbed dose rate due to radionuclides in sand was estimated to range from 51.84 to 246.55 nGy.h–1 with an average of 98.33 nGy.h–1. Also the average absorbed dose rate due to radionuclides in soil was estimated to range from 76.63 nGy.h–1 to 142.36 nGy.h–1 with an average of 110.04 nGy.h–1. Radium equivalent activities were calculated for the analyzed samples to assess the radiation hazards arising due to the presence of this radionuclide in the samples. Most of the calculated radium equivalent activities are lower than the limit set in the OECD report (370 ***–1). The measured representative level index values for the investigated samples varied in the range 0.8 to 3.75.

关键词： Radionuclide Activity Concentration HPGe detector Kuakata Seabeach 226Ra 232Th and 40K and 137Cs

A Study on the Radioactivity Level in Raw Materials, Final Products and Wastes of the Phosphate Fertilizer Industries in Bangladesh

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Journal of Environmental Protection 2012年第10期3卷 1393-1402页

作者： Md. Abdus Samad Md. Abu Haydar Md. Idris Ali debasish paul Md. Mahbubur R. Bhuiyan Sheikh Mohammad A. Islam Department of Physics Comilla University Comilla Bangladesh Department of Physics Jahangirnagar University Savar Bangladesh Health Physics and Radioactive Waste Management Unit Institute of Nuclear Science and Technology Atomic Energy Research Establishment Savar Bangladesh

A study on the detection of probable radionuclides and their activity concentrations in the raw material (phosphate rock), final product (fertilizer) and waste samples collected from all the phosphate fertilizer factories (total two factories—A Diammonium Phosphate, DAP and a Triple Super Phosphate, TSP factory) in Bangladesh were carried out. A total of seven types of samples (grossly divided into solid and liquid types);liquid waste, waste-mixed river water, normal river water, phosphate rock, phosphate fertilizer, solid waste and normal soil;were analyzed under this study. Raw material samples were collected only from the TSP fertilizer factory. Fertilizer, solid and liquid waste samples were collected from both the factories under study. Moreover, normal soil and natural surface water samples from the suitable areas adjacent to the factories were also collected for the comparison purpose. The samples were analyzed by gamma ray spectrometry technique using a Hyper-Pure Germanium (HPGe) detector of 40% relative efficiency. The analysis of the samples showed that only natural radionuclides such as 226Ra, 232Th and 40K were present in the samples and no traces of artificial radioactivity were found in any of the samples. 40K was found below the detection limit in some samples. The analysis of the samples in the case of TSP fertilizer factory showed that the average activity concentrations of 226Ra and 232Th and 40K in raw materials were 851.27 ± 7.10, 19.63 ± 6.57 and 54.06 ± 5.93 Bq/kg, respectively, in final product 211.90 ± 4.74, 42.48 ± 10.56 Bq/kg and ND (Not Detected), respectively, in solid waste 187.49 ± 4.88, 70.06 ± 11.76 and 289.27 ± 40.24 Bq/kg, respectively and in liquid waste 6.26 ± 0.63, 10.01 ± 1.39 Bq/L and ND, respectively. The measured results in the case of samples collected from DAP fertilizer factory showed that the average activity concentrations of 226Ra and 232Th and 40K in the final product were 17.31 ± 3.92, 69.74 ± 9.88 and 48.46 ± 17.22

关键词： Raw Materials Radioactivity Phosphate Fertilizers and HPGe Detector

Heavy Minerals in Sands along Brahmaputra (Jamuna) River of Bangladesh

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International Journal of Geosciences 2016年第1期7卷 47-52页

作者： Md. Ibrahim Khalil Md. Nazrul Islam Khan Md. Zafrul Kabir Ratan Kumar Majumder Md. Idris Ali debasish paul Syed Mohammad Azharul Islam Nuclear Minerals Unit Atomic Energy Research Establishment Dhaka Bangladesh Material Science Division Atomic Energy Center Bangladesh Atomic Energy Commission Dhaka Bangladesh Health Physics and Radioactive Waste Management Unit Atomic Energy Research Establishment Dhaka Bangladesh Department of Physics Jahangirnagar University Dhaka Bangladesh

Sands along Brahmaputra River of Bangladesh have long been considered to be a source of heavy minerals (HMs) since it traversed a long way through various terrains. An attempt has been made under this research work to determine the kinds and amounts of heavy minerals in the sands sourced from the river system. Samples from 14 locations along Brahmaputra River covering 30 km distance from upstream to downstream of the river are found to contain different heavy minerals concentration with a range of 7.92 - 25.16 weight% with the remaining of the sample comprising silicate and aluminosilicates. Mineral characterization from peak positions in diffractogram of X-ray Diffraction (XRD) evaluate quartz, feldspar and mica are major categories light mineral while rutile, magnetite, illmenite, zircon, monazite, garnet, uranium arsenide and uranium fluoride are the major types heavy minerals. Ilmenite and rutile are main contributors of total heavy mineral (THM). Titanium bearing minerals ilmenite and rutile contributes 26.22% - 31.01% and 14.57% - 23.50% of THM. In the present study area, most of the sands are found to be fine and medium grained as obtained from the particle sizes analysis using 18- to 230-mesh.

关键词： Heavy Minerals River Sand Bangladesh