Dina Nafisa Tamannaya, Das Sudeb Chandra, Kabir Mohammad Zafrul, Rasul Md Golam, Deeba Farah, Rajib Mohammad, Islam Md Safiqul, Hayder Md Abu, Ali Md Idris
Institute of Nuclear Minerals, Bangladesh Atomic Energy Commission, Savar, Dhaka, 1349 Bangladesh.
Health Physics and Radioactive Waste Management Unit, Institute of Nuclear Science and Technology, Bangladesh Atomic Energy Commission, Savar, Dhaka, 1349 Bangladesh.
J Radioanal Nucl Chem. 2022;331(11):4457-4468. doi: 10.1007/s10967-022-08562-0. Epub 2022 Oct 11.
Natural radioactivity concentrations in recent alluvial soils from swampy areas and Tertiary rocks from Jaintiapur were measured using gamma-ray spectrometer equipped with HPGe detector. The average radioactivity concentration of Ra, Th and K were 47 ± 6, 64 ± 5 and 762 ± 40 Bqkg in soils, whereas, 25 ± 2, 37 ± 4 and 884 ± 41 Bqkg in rock samples, respectively. Average radioactivity concentrations of studied soil and rock samples exceeded the world average except Ra for rocks. Radio-elemental ratios suggest that an oxic depositional environment with low uranium and high thorium content. Regarding radiological hazard indices, radium equivalent activities (Ra), external hazard index ( ) and internal hazard index ( ) was found to be below the world permissible limits. Whereas, absorbed dose rate (D), and annual effective dose equivalent (AEDE) averages exceeded the world admissible values. Statistical studies show that radioactivity for Ra and Th linked to a source enriched in radioactive minerals and K related to a different sources high in K enriched minerals.
使用配备高纯锗探测器的伽马射线光谱仪，测量了来自沼泽地区的近期冲积土和来自詹蒂亚布尔的第三纪岩石中的天然放射性浓度。土壤中镭（Ra）、钍（Th）和钾（K）的平均放射性浓度分别为47±6、64±5和762±40贝克勒尔/千克，而岩石样品中的分别为25±2、37±4和884±41贝克勒尔/千克。除岩石中的镭外，所研究的土壤和岩石样品的平均放射性浓度超过了世界平均水平。放射性元素比率表明存在一个铀含量低、钍含量高的氧化沉积环境。关于放射危害指数，镭当量活度（Ra）、外照射危害指数（ ）和内照射危害指数（ ）均低于世界允许限值。然而，吸收剂量率（D）和年有效剂量当量（AEDE）的平均值超过了世界可接受值。统计研究表明，镭和钍的放射性与富含放射性矿物的源有关，而钾则与富含钾矿物的不同源有关。
