A Study on the Radioactivity Level in Raw Materials, Final Products and Wastes of the Phosphate Fertilizer Industries in Bangladesh
- 1 Department of Physics, Jahangirnagar University, Savar, Bangladesh
- 2 Health Physics and Radioactive Waste Management Unit, Institute of Nuclear Science and Technology, Atomic Energy Research Establishment, Savar, Bangladesh
- 3 Health Physics and Radioactive Waste Management Unit, Institute of Nuclear Science and Technology, Atomic Energy Research Establishment, Savar, Bangladesh
- 4 Health Physics and Radioactive Waste Management Unit, Institute of Nuclear Science and Technology, Atomic Energy Research Establishment, Savar, Bangladesh
- 5 Department of Physics, Comilla University, Comilla, Bangladesh
- 6 Department of Physics, Jahangirnagar University, Savar, Bangladesh
Abstract
A study on the detection of probable radionuclides and their activity concentrations in the raw material (phosphate rock), final product (fertilizer) and waste samples collected from all the phosphate fertilizer factories (total two factories—A Diammonium Phosphate, DAP and a Triple Super Phosphate, TSP factory) in Bangladesh were carried out. A total of seven types of samples (grossly divided into solid and liquid types); liquid waste, waste-mixed river water, normal river water, phosphate rock, phosphate fertilizer, solid waste and normal soil; were analyzed under this study. Raw material samples were collected only from the TSP fertilizer factory. Fertilizer, solid and liquid waste samples were collected from both the factories under study. Moreover, normal soil and natural surface water samples from the suitable areas adjacent to the factories were also collected for the comparison purpose. The samples were analyzed by gamma ray spectrometry technique using a Hyper-Pure Germanium (HPGe) detector of 40% relative efficiency. The analysis of the samples showed that only natural radionuclides such as 226 Ra, 232 Th and 40 K were present in the samples and no traces of artificial radioactivity were found in any of the samples. 40 K was found below the detection limit in some samples. The analysis of the samples in the case of TSP fertilizer factory showed that the average activity concentrations of 226 Ra and 232 Th and 40 K in raw materials were 851.27 ± 7.10, 19.63 ± 6.57 and 54.06 ± 5.93 Bq/kg, respectively, in final product 211.90 ± 4.74, 42.48 ± 10.56 Bq/kg and ND (Not Detected), respectively, in solid waste 187.49 ± 4.88, 70.06 ± 11.76 and 289.27 ± 40.24 Bq/kg, respectively and in liquid waste 6.26 ± 0.63, 10.01 ± 1.39 Bq/L and ND, respectively. The measured results in the case of samples collected from DAP fertilizer factory showed that the average activity concentrations of 226 Ra and 232 Th and 40 K in the final product were 17.31 ± 3.92, 69.74 ± 9.88 and 48.46 ± 17.22 Bq/kg, respectively, in solid waste 24.47 ± 4.15, 164.62 ± 11.08, 191.52 ± 33.74 Bq/kg, respectively and in liquid waste 3.59 ± 1.05, 37.08 ± 3.30 Bq/L and ND, respectively. Considering the stored raw materials and wastes the part of the ambient environment of the factory, radium equivalent activity, radiation hazard index and external annual effective dose to the workers and public due to these materials were also calculated and compared with world average values.
- C. H. Saueia, B. P. Mazzilli and D. I. T. Favaro, “Natural Radioactivity in Phosphate Rock, Phosphogypsum and Phosphate Fertilizers in Brazil,” Journal of Radioanalytical and Nuclear Chemistry, Vol. 264, No. 2, 2005, pp. 445-448. doi:10.1007/s10967-005-0735-4
- C. H. R. Saueia and B. P. Mazzilli, “Distribution of Natural Radionuclides in the Production and Use of Phosphate Fertilizers in Brazil,” Journal of Environmental Radioactivity, Vol. 89, No. 3, 2006, pp. 229-239. doi:10.1016/j.jenvrad.2006.05.009
- B. Mazzilli, V. Palmiro, C. Saucia and M. B. Nisti, “Radiochemical Characterization of Brazilian Phosphogypsum.” Journal of Environmental Radioactivity, Vol. 49, No. 1, 2000, pp. 113-122. doi:10.1016/S0265-931X(99)00097-1
- International Atomic Energy Agency, “Measurement of Radionuclides in Food and the Environment,” Technical Report No. 295, Vienna, 1989.
- M. Tufail, M. Iqbal and S. M. Mirza, “Radiation Doses Due to Natural Radioactivity in Pakistan Marble,” Radioprotection, Vol. 35, No. 3, 2000, pp. 299-310.
- M. Islam, N. M. N. Alam, M. N. Mustafa, N. Siddique, M. M. H. Miah, S. L. Shaha, M. I. Chowdhury, M. Kamal, L. Ali and P. K. Roy, “Characteristics of a Shielding Arrangement for a HPGe Detector Designed and Fabricated Locally,” Chittagong University Studies, Part II, Science, Vol. 14, No. 2, 1990, pp. 105-111.
- C. E. Roessier, Z. A. Smith, W. E. Bolch and R. J. Prince, “Uranium and Radium in Floride Phosphate Materials,” Health Physics, Vol. 37, No. 3, 1979, pp. 269-277. doi:10.1097/00004032-197909000-00001
- M. S. Tahawy, M. A. Rarouk, F. H. Hammad and N. M. Ibrahiem, “Natural Potassium as a Standard Source for the Absolute Efficiency Calibration of Ge Detectors,” Journal of Nuclear Science, Vol. 29, 1992, pp. 361-363.
- S. Harb, K. S. Din and A. Abbady, “Study of Efficiency Calibrations of HPGe Detectors for Radioactivity Measurement of Environmental Samples,” Proceedings of the 3rd Environmental Physics Conference, 19-23 February 2008, Aswan.
- M. A. Usif and A. E. Taher, “Radiological Assessment of Abu-Tartur Phosphate, Western Desert Egypt,” Radiation Protection Dosimetry, Vol. 130, No. 2, 2008, pp. 228-235.doi:10.1093/rpd/ncm502
- G. F. Knoll, “Radiation Detection and Measurement,” 3 Edition, John Wiley & Sons, New York, 1998.
- S. Long, S. Sdraulig, L. Hardege and J. Mcleigh, “The Radioactivity Content of Some Australian Drinking Water,” ARPANSA Technical Report Series, No. 148, 2008.