Orthi Khairum Haque, Sultana Thuheda, Ferdous Jannatul, Siraz Mia Mohammad Mahfuz, Hannan Abdul
Department of Physics, Shahjalal University of Science and Technology, Sylhet 3114, Bangladesh.
Health Physics Division, Atomic Energy Centre Dhaka, Bangladesh Atomic Energy commission, Dhaka 1000, Bangladesh.
Radiat Prot Dosimetry. 2025 Apr 7;201(5):386-397. doi: 10.1093/rpd/ncaf027.
The natural radioactivity level in soil, sediment, and water samples collected from the Bisnakandi region in Sylhet was measured using a high-purity germanium detector. The mean activity concentrations of radionuclides in samples from the Bisnakandi were: 232Th (surface soil: 28.60 ± 6.44 Bq/kg, depth soil: 34.97 ± 7.37 Bq/kg, sediment: 41.70 ± 8.22 Bq/kg, water: 16.37 ± 2.13 Bq/L), 226Ra (surface soil: 33.70 ± 6.85 Bq/kg, depth soil: 40.09 ± 8.06 Bq/kg, sediment: 47.60 ± 9.38 Bq/kg, water: 19.76 ± 3.16 Bq/L), and 40K (surface soil: 304.60 ± 20 Bq/kg, depth soil: 375 ± 23.10 Bq/kg, sediment: 455.80 ± 19.2 Bq/kg, water: 241 ± 19.70 Bq/L). The average activity concentrations in rock samples for 232Th, 226Ra, and 40K in (Jaflong, Bholagonj) were (45.69 ± 14.32 Bq/kg, 40.06 ± 12.71 Bq/kg), (36.27 ± 16.89 Bq/kg, 36.84 ± 13.02 Bq/kg), and (430.34 ± 36.82 Bq/kg, 426.7 ± 78.98 Bq/kg), respectively. All the hazard parameters, such as radium equivalent activity, absorbed dose, annual effective dose, and external hazard index, were found within the acceptable level recommended by international organizations.
