کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5477474 | 1521563 | 2017 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Study of the formation of the primary 137Cs vertical profile in the organic matter-rich sediments
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی هسته ای و مهندسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A laboratory study of the formation of the primary vertical profile of the 137Cs activity concentration in the anaerobic organic matter-rich sediments was carried out. The incubation was performed using sediment baths method (initial thickness of the water layer over the sediments â¼40 cm, initial radiocesium activity concentration in water â¼14.53 Bq·Lâ1). An exponential profile (R2â¼0.999) with the half-height width of â¼0.65 cm was formed after â¼32 days of the incubation. A further course of the experiment (sediments were sampled after 64, 130 and 293 days of the incubation) revealed deviations in the form of the radiocesium activity concentration profile related to the appearance of the additional Gauss factor with the increasing half-height width of â¼1.2, â¼1.3 and â¼3 cm, respectively. In spite of the evident growth of the half-height width, the radiocesium migration rate decreased from 0.02 cm·dayâ1 for the first 32 days of incubation down to 0.009 cm·dayâ1 at the end of the incubation experiment. Such a time-dependent decrease in the radiocesium migration is possibly related to the beginning of the second radiocesium migration phase depending on the retardation factor. Besides diffusion, the formation of vertical profiles of radiocesium activity concentrations in sediments was additionally induced by effects of buoyancy of the upper sediment layer due to the seepage of the above lying water into sediments.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Environmental Radioactivity - Volume 177, October 2017, Pages 206-217
Journal: Journal of Environmental Radioactivity - Volume 177, October 2017, Pages 206-217
نویسندگان
N. Tarasiuk, B. LukÅ¡ienÄ, E. Maceika, V. FilistoviÄius, Z. ŽukauskaitÄ, L. NedzveckienÄ, Å . Buivydas,