Department of Environmental Sciences, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, 45320, Pakistan.
Health Physics Division, Pakistan Institute of Nuclear Science and Technology, P.O. Nilore, Islamabad, Pakistan.
Chemosphere. 2021 Mar;267:129171. doi: 10.1016/j.chemosphere.2020.129171. Epub 2020 Dec 2.
The aim of the study was to evaluate the radiation levels, radiological doses and excess lifetime cancer risk possessed by the urban soils that were collected from the vicinity of the exclusive mining and excavation centers of Dera Ghazi Khan. The high purity germanium detector was utilized for assessment of naturally occurring radionuclides (NORMs) in soil and results showed that the average activity concentrations of Ra, Th, and K (37 Bq/kg, 43.07 Bq/kg, 737 Bq/kg respectively) surpassed the world's average documented values (35 Bq/kg, 30 Bq/kg, and 400 Bq/kg respectively). Moreover, the average values of radiological hazards assessment like radium equivalent, internal and external hazard indices, absorbed dose rate, annual gonadal dose equivalent and excess lifetime cancer risk were 155.70 (Bq/kg), 0.4, 0.5, 73.96 (nGy/h) 90.73 (μSv/y), 476.24 (μSv/y) and 0.31(10) respectively. The data acquired was analyzed using descriptive statistics, cluster analysis and principal component analysis. ArcGIS (10.5) software was utilized for developing maps of radionuclide's concentration for the study area. Results of the study may serve as an important baseline radiometric data for future epidemiological studies and monitoring initiatives in the study area.
这项研究的目的是评估来自德拉加济汗专属采矿和挖掘中心附近的城市土壤的辐射水平、放射性剂量和超额寿命癌症风险。使用高纯锗探测器评估土壤中的天然放射性核素 (NORM)，结果表明，Ra、Th 和 K 的平均活度浓度（分别为 37 Bq/kg、43.07 Bq/kg 和 737 Bq/kg）超过了世界平均记录值（分别为 35 Bq/kg、30 Bq/kg 和 400 Bq/kg）。此外，辐射危害评估的平均值，如镭当量、内外危害指数、吸收剂量率、年性腺剂量当量和超额寿命癌症风险分别为 155.70 (Bq/kg)、0.4、0.5、73.96 (nGy/h)、90.73 (μSv/y)、476.24 (μSv/y) 和 0.31(10)。使用描述性统计、聚类分析和主成分分析对获得的数据进行了分析。ArcGIS（10.5）软件用于为研究区域绘制放射性核素浓度图。研究结果可以作为未来该地区流行病学研究和监测计划的重要基线放射性数据。
