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To study the potential redistributions of NORMs from gas-wells to ambient-environment in and around gas-field and to evaluate affiliated radiological-risks, a suite of systematically collected samples were measured by HPGe-detector. Radioactivity concentrations of 226Ra, 232Th, and 40K in gas-well samples are 60 ± 13, 94 ± 14, 2200 ± 400 Bq kg−1 whereas in environmental samples they are 40 ± 9, 73 ± 11, 873 ± 180 Bq kg−1, respectively. Surface-soil possesses higher NORMs compared to the corresponding subsurface-soil which demonstrated technogenic incorporation of NORMs. Distribution of NORMs in ambient environment are controlled by several natural and anthropogenic factors. Evaluation of radiological indices suggests considerable risks and invoke routine monitoring of radiation in and around gas-fields. [ABSTRACT FROM AUTHOR]

Geochemical characterization of Shahbazpur structure (Bengal Foredeep) in terms of elemental abundances obtained from INAA are presented by investigating core samples from Shabazpur gas-field, Bangladesh. Major oxides' abundances were 12.4–20.8, 0.63–1.03, 4.45–8.02, 0.05–0.09, 2.60–4.10 and 1.31–1.87% for Al2O3, TiO2, Fe2O3(T), MnO, K2O and Na2O, respectively. Elemental ratios and enrichment pattern (× 1.10–2.11 UCC) indicate that sedimentary processes originated from Himalayan felsic source-rock. Weathering index and Th/U(= 5.90–6.59), V/Cr(= 1.07–1.38) ratios revel that sediments/rocks were experienced moderate to high degree of chemical weathering with oxidizing environment. La-Th-Sc immobile trace elements diagram invoke depositional tectonic settings which was transitional between active and passive continental margin. [ABSTRACT FROM AUTHOR]