کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8080814 | 1521559 | 2018 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Natural radioactivity in soils of the state of Rio de Janeiro (Brazil): Radiological characterization and relationships to geological formation, soil types and soil properties
ترجمه فارسی عنوان
رادیواکتیویته طبیعی در خاک ریودوژانیرو (برزیل): مشخصات رادیولوژیکی و ارتباط آن با شکل گیری زمین شناسی، نوع خاک و خواص خاک
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کلمات کلیدی
رادیو اکتیوهای طبیعی، خاک نقشه برداری رادیو اکتیو،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی هسته ای و مهندسی
چکیده انگلیسی
Located in the south-western part of Brazil, the state of Rio de Janeiro is geotectonically contained within a complex structural province that resulted in the amalgamation of the Western Gondwana Paleocontinent. To undertake an extensive radiological characterization of this complex geological province and investigate the influence of bedrock, soil type and soil chemical-physical characteristics on natural radionuclide levels in soils, 259 surface soil samples were collected that encompassed the main soil types and geological formations throughout the state. Gamma spectrometry analysis of the samples resulted in median values of 114 Bq.kgâ1for 40K, 32 Bq.kgâ1 for 226Ra and 74 Bq.kgâ1 for 228Ra. The median value for 226Ra was similar to the world median value for soils, the 40K value was well below the worldwide value, and that for 228Ra exceeded the world median value. The intense weathering caused by the high rainfall rates and high temperatures may be responsible for the low levels of 40K in the soils, of which the strongly acidic and clayey soils are markedly K-depleted. A soil from a high-grade metamorphic rock (granulite) presented the lowest 226Ra (18 Bq.kgâ1) content, whereas the highest levels for 226Ra (92 Bq.kgâ1) and 228Ra (139 Bq.kg-1) were observed in a young soil enriched in primary minerals (Leptsol). A lowland soil (Gleysol) showed the highest median of 40K (301 Bq.kgâ1). Strongly acidic soils tended to present high amounts of 226Ra, and sandy soils tended to contain low levels of 228Ra. The external radiation dose indicates that the state has a background radiation level within the natural range.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Environmental Radioactivity - Volume 182, February 2018, Pages 34-43
Journal: Journal of Environmental Radioactivity - Volume 182, February 2018, Pages 34-43
نویسندگان
F.C.A. Ribeiro, J.I.R. Silva, E.S.A. Lima, N.M.B. do Amaral Sobrinho, D.V. Perez, D.C. Lauria,