title: Assessment of natural radioactivity in phosphate ore, phosphogypsum and soil samples around a phosphate fertilizer plant in Nigeria.
abstract: The radionuclides present in phosphate ore, phosphogypsum and soil samples in the vicinity of a phosphate fertilizer plants in Nigeria were identified and their activity concentration determined to assess the potential radiation impact on the environment due to fertilizer production. The mean activity concentration of (238)U, (232)Th, and (40)K radionuclides in phosphate ore samples were 616 ± 38.6, BDL (Below Detection Level) and 323.7 ± 57.5 Bq kg(-1) respectively. For the phosphogypsum, 334.8 ± 8.8, 4.0 ± 1.4, and 199.9 ± 9.3 Bq kg(-1) respectively and for soil samples range from 20.5 ± 7.3 to 175.7 ± 10.5 Bq kg(-1) for (226)Ra, 15.5 ± 1.5 to 50.4 ± 0.6 Bq kg(-1) for (232)Th and 89.5 ± 8.1 to 316.1 ± 41.3 Bq kg(-1) for (40)K respectively. The mean absorbed dose rate was 71.4 nGy h(-1). The mean annual effective dose was 86 μSv.
authors.affiliation: Department of Medical Radiography and Radiological Sciences, Faculty of Health Sciences and Technology, University of Nigeria, Enugu Campus, Enugu, Nigeria. markokeji@yahoo.com
authors.forename: Mark C
authors.initials: MC
authors.lastname: Okeji
authors.forename: Kenneth K
authors.initials: KK
authors.lastname: Agwu
authors.forename: Felicitas U
authors.initials: FU
authors.lastname: Idigo
mesh_terms: D001417:Background Radiation; D002133:Calcium Sulfate / Q000032:analysis* / Q000737:chemistry; D005308:Fertilizers; D009549:Nigeria; D010710:Phosphates / Q000032:analysis*; D010758:Phosphorus / Q000032:analysis* / Q000737:chemistry; D011834:Radiation Monitoring; D012987:Soil / Q000737:chemistry*; D012990:Soil Pollutants, Radioactive / Q000032:analysis*
chemical_list: D005308:Fertilizers; D010710:Phosphates; D012987:Soil; D012990:Soil Pollutants, Radioactive; C077769:phosphogypsum; D010758:Phosphorus; D002133:Calcium Sulfate