کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5477456 1521563 2017 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Natural radionuclides in plants, soils and sediments affected by U-rich coal mining activities in Brazil
ترجمه فارسی عنوان
رادیو اکتیو های طبیعی در گیاهان، خاک ها و رسوبات تحت تاثیر فعالیت های معدن زغال سنگ غنی از غنی در برزیل
کلمات کلیدی
بیومونیتوری، استخراج از معادن زغال سنگ، اورانیوم، توریم، پولونیوم،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی هسته ای و مهندسی
چکیده انگلیسی


- Coal contains U and Po that can be released into the environment.
- Coal mining is a source of U and Po to nearby cultivated soils.
- Pine and eucalyptus can act as biomonitors for soil pollution.
- Soybean and wheat can absorb U and Po in high levels.
- Biologic and environmental features affect bioaccumulation patterns.

Mining activities can increase the mobility of metals by accelerating the dissolution and leaching of minerals from the rocks and tailing piles to the environment and, consequently, their availability for plants and subsequent transfer to the food chain. The weathering of minerals and the disposal of coal waste in tailing piles can accelerate the generation of acid mine drainage (AMD), which is responsible for the higher dissolution of metals in mining areas. In this context, the behavior of U, Th and K in soils and sediment, and the transfer factor (TF) of 238U, 234U and 210Po for soybean, wheat, pine and eucalyptus cultivated around a coal mine in southern Brazil was evaluated. Alpha and gamma spectrometry were used for the measurements of the activity concentration of the radioelements. 210Po was the radionuclide that is most accumulated in the plants, especially in the leaves. When comparing the plant species, pine showed the highest TF values for 234U (0.311 ± 0.420) for leaves, while eucalyptus showed the highest TF for 238U (0.344 ± 0.414) for leaves. In general, TF were higher for the leaves of soybean and wheat when compared to the grains, and grains of wheat showed higher TF for 210Po and 238U than grains of soybean. Deviations from the natural U isotopic ratio were recorded at all investigated areas, indicating possible industrial and mining sources of U for the vegetables. A safety assessment of transport routes and accumulation of radionuclides in soils with a potential for cultivation is important, mainly in tropical areas contaminated with solid waste and effluents from mines and industry.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Environmental Radioactivity - Volume 177, October 2017, Pages 37-47
نویسندگان
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