An Environmental Impact Study of Jamuna Urea Fertilizer Factory at Tarakandi in Jamalpur with Radiological Indices

The activity concentrations of 226 Ra, 232 Th and 40 K have been determined in solid and liquid samples collected from the Jamuna Urea Fertilizer Factory, Tarakandi, Jamalpur, Bangladesh. Six different types of samples, namely, i) the liquid waste water stored inside the factory ii) water sample near the liquid waste disposal point of Jamuna river iii) liquid-waste-mixed soil iv) normal soil adjacent to the factory v) the final product (Urea) and vi) urea dust of the factory have been analyzed by gamma spectrometric technique using a high purity germanium (HPGe) detector of 40% relative efficiency. The activity concentration of 226 Ra was determined from the average concentrations of the 214 Pb and 214 Bi decay products, the activity concentration of 232 Th was determined from the average concentrations of 208 Tl and 228 Ac, whereas the concentration of 40 K was measured directly. The analysis of the liquid waste samples showed that the average activity concentrations of 226 Ra and 232 Th were 3.64 ± 0.72 and 12.94 ± 2.02 Bq/L, respectively and no 40 K was detected in any of the samples. In the liquid-waste-mixed soil samples the average value of activity concentrations of 226 Ra, 232 Th and 40 K were 21.45 ± 3.19, 63.00 ± 8.10 and 311.97 ± 90.93 Bq/kg, respectively whereas in the normal soil the values were 20.97 ± 3.56, 61.77 ± 8.93 and 645.48 ± 103.62 Bq/kg, respectively. Considering the stored wastes as a part of the ambient environment of the factory, radium equivalent activity, radiation hazard index and external annual effective dose to the worker and the public due to these wastes were calculated and compared with the world average values.