کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1738839 1016817 2010 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Seasonal and inter-annual variation of Beryllium-7 deposition in birch-tree leaves and grass in the northeast upland area of the Czech Republic
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی هسته ای و مهندسی
پیش نمایش صفحه اول مقاله
Seasonal and inter-annual variation of Beryllium-7 deposition in birch-tree leaves and grass in the northeast upland area of the Czech Republic
چکیده انگلیسی

The activity concentrations of Beryllium-7 (7Be), a naturally occurring radioisotope produced in the atmosphere, were measured in leaves of birch-trees, above-ground parts of grass, soil and rainwater in the mountain massive Kralicky Sneznik (the northeast of the Czech Republic, altitude about 750 m) in the years of 2005, 2006 and 2007. Dried and ground samples of the plants and soils, and water samples from wet deposition were used to determine the 7Be content using a semiconductor gamma spectrometer. The 7Be values ranged from 147.0 to 279.6 Bq kg−1, from 48.7 to 740.8 Bq kg−1, from 2.1 to 8.7 Bq kg−1, and from 0.6 to 1.9 Bq kg−1 in birch-tree leaves, grass samples, soils, and rainwater, respectively. Insignificant inter-annual variations but significant increase in the 7Be activity concentrations during the spring and summer months were observed in birch-tree leaves and grass samples. The seasonal variation of the 7Be concentrations in grass samples correlated (R2 = 0.4663 and 0.6489) with precipitation. No similar correlation was found for 7Be in birch-tree leaves. Beryllium-7 content in birch-tree leaves and in aerial parts of grass was mainly caused by direct transport of 7Be from wet deposition into aerial parts of the observed plants.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Environmental Radioactivity - Volume 101, Issue 9, September 2010, Pages 744–750
نویسندگان
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