Environmental geochemistry of higher radioactivity in a transboundary Himalayan river sediment (Brahmaputra, Bangladesh): potential radiation exposure and health risks

Primordial radionuclides in the dust samples from the educational institutions of central Bangladesh: radiological risk assessment

“… 100 0.27 0.30 47.3 0.058 0.75 2.03 × 10 −4 Max. 318 0.86 1.39 147.3 0.181 2.22 6.32 × 10 −4 Recommended a 370 <1 <1 55 0.46 1.00 2.90 × 10 −4 a Khan et al. (2022b) .…”

“…Various types of physiological problems, e.g., lung cancer, renal failure, kidney dysfunction, and bone deformities may be caused by exposure to NORMs ( Majlis et al., 2022 ; Islam et al., 2022 ; Habib et al., 2019a , 2019b ). NORMs distributions in differential environmental constituents (e.g., dust, sediment, soil, water) mostly depend on climatic conditions, local geology, & weathering processes ( Khan et al., 2022a , 2022b ; Alonso-Hernández et al., 2018 ; Alam et al., 1999 ). NORMs' occurrence in soil and/or sediment is mostly correlated with external exposure to radiation if the inhalation of gaseous radon is overlooked.…”

Indexical and statistical approaches to investigate the integrated origins of elements in the sediment of Teesta River, Bangladesh: sediment quality and ecological risk assessment

“…14,77,81 Aside from this, a very high correlation between typical lithophile elements Th and U (r = 0.886; p < 0.01) (Table S5 †) in this study demonstrated similar sedimentary characteristics and was hypothesized to be governed by wave hindering heavy minerals, namely monazite [(La, Ce, Nd, Th) PO 4 ] (Th-rich mineral) and zircon (ZrSiO 4 ) (U-rich mineral). 1,82 As a result, in an oxidizing environment, Th is weather-resistant (remains as insoluble Th 4+ ), but U transforms into a soluble oxyanion-complex (UO 2 ) and may easily be depleted from sediment by leaching and/or weathering. 1,14,68 Thus, U mobilization enhanced the Th/U ratio in Teesta River basin sediments, indicating monazite predominance.…”

“…1,82 As a result, in an oxidizing environment, Th is weather-resistant (remains as insoluble Th 4+ ), but U transforms into a soluble oxyanion-complex (UO 2 ) and may easily be depleted from sediment by leaching and/or weathering. 1,14,68 Thus, U mobilization enhanced the Th/U ratio in Teesta River basin sediments, indicating monazite predominance. 14 All of these statistical studies provide a comprehensive assessment of component solubility, diagenetic environment, geological characteristics, and anthropological origin.…”

“…However, the elevated presence of elemental concentrations might induce some ecotoxicological concern. [1][2][3][4] Besides, rapid urbanization, unplanned industrialization, and random expansion of agricultural chemicals are continuously discharging a wide variety of extraneous pollutants into the uvial system, which may create severe sediment contamination. [5][6][7][8] Sediment, in contrast, has the capacity to accumulate toxins existing in the environmental system (soil and water) at a faster rate.…”