评估尼日利亚一家磷肥厂周围磷矿石、磷石膏和土壤样本中的天然放射性。
Assessment of natural radioactivity in phosphate ore, phosphogypsum and soil samples around a phosphate fertilizer plant in Nigeria.
机构信息
Department of Medical Radiography and Radiological Sciences, Faculty of Health Sciences and Technology, University of Nigeria, Enugu Campus, Enugu, Nigeria.
出版信息
Bull Environ Contam Toxicol. 2012 Nov;89(5):1078-81. doi: 10.1007/s00128-012-0811-8. Epub 2012 Sep 11.
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.
在尼日利亚一家磷肥厂附近的磷酸盐矿石、磷石膏和土壤样本中，确定了放射性核素的存在，并测定了它们的活度浓度，以评估肥料生产对环境可能产生的辐射影响。磷矿石样本中（238）U、（232）Th 和（40）K 放射性核素的平均活度浓度分别为 616 ± 38.6、BDL（低于检测限）和 323.7 ± 57.5 Bq kg(-1)。对于磷石膏，分别为 334.8 ± 8.8、4.0 ± 1.4 和 199.9 ± 9.3 Bq kg(-1)，而土壤样本中（226）Ra 的范围为 20.5 ± 7.3 至 175.7 ± 10.5 Bq kg(-1)，（232）Th 的范围为 15.5 ± 1.5 至 50.4 ± 0.6 Bq kg(-1)，（40）K 的范围为 89.5 ± 8.1 至 316.1 ± 41.3 Bq kg(-1)。平均吸收剂量率为 71.4 nGy h(-1)。平均年有效剂量为 86 μSv。
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