出版社：The International Institute for Science, Technology and Education (IISTE)
摘要：The specific activities of natural and artificial radionuclides in 22 soil samples collected from Habiganj district in Bangladesh, have been Studied and evaluated. Experimental results were obtained by using a High Purity Germanium (HPGe) Detector and the radioactive standard sources supplied by IAEA were used to determine the efficiency. The measuring time of all samples is 5000 seconds. It was found that, the soil specific activity ranges from 5.27733 ± 0.01534 - 18.8277 ± 0.0155 Bq/kg for Radium-226 ( 226 Ra), 7.1355 ± 0.00248 - 38.1423 ± 0.00338 Bq/kg for Thorium-232 ( 232 Th) and 93.140877±0.006196 - 392.62765±0.007421 Bq/kg for Potassium-40 ( 40 K), with mean values of 11.09224 ± 0.01090 Bq/kg, 21.98392 ±0.00293 Bq/kg and 227.96598± 0.00676 Bq/kg respectively. It was also found that there is no artificial radionuclide ( 137 Cs) in any kind of samples of Habiganj district. In order to evaluate the radiological hazard of the natural and artificial radioactivity, Radium equivalent activity (Ra eq ), gamma absorbed dose rate, The external hazard index (H ex ), annual effective dose rate for different soil samples were calculated 58.513 Bq/Kg, 27.99008 nGy/h, 0.162327, 33.17704 µSv respectively.
