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Tesfatsion, Yosief, 2012. Studies of the transfer of radionuclides and dose rate assessments in the pasture lands located in the counties of Uppsala and Jämtland . Second cycle, A2E. Uppsala: SLU, Dept. of Soil and Environment

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Abstract

The study was conducted in the pastoral lands of two Counties, Uppsala and Jämtland
Counties. Soil and grass samples were collected from six study areas. Two from Uppsala
County: Lövstalöt and Möjsjövik, and four from Jämtland County: Backfors, Hallen,
Myrviken and Vikdrolet. Milk samples were also collected from Lövstalöt (Uppsala County)
and Hallen and Oviken (Jämtland County). The study aims at analyzing the presence and
activity concentration of natural radionuclides and 137Cs from Chernobyl accident and
determines their transfer factor from soil to grass and from grass to milk. It also describes the
migration of 137Cs and the homogeneity of concerned natural radionuclides in the soil profile
of the study areas. The third objective of the study was to assess in situ and laboratory
outdoor dose rate in air of radionuclides in the study areas and make comparison between
Counties and the methods. Higher concentrations of natural radionuclides were found in
Jämtland study areas than in Uppsala due to the geological background of the area rich in
natural radionuclides. But, higher concentration of 137Cs was found in Uppsala than in
Jämtland due to higher anthropogenic deposition from Chernobyl accident. Activity
concentrations of the radionuclides were higher than suggested by UNSCEAR. In Uppsala
study areas, higher total annual effective dose rate of radionuclides were found in the
laboratory measurement than in situ. A similar finding was obtained in Jämtland study areas
except in Hallen. In Jämtland County, the contribution of artificial radionuclide (137Cs) was
not very significant to the total annual effective dose rate and much concern could be given to
the natural radionuclides dose rate assessment. In Uppsala County, however, it can be
advocated that equal concerns should be given to both artificial radionuclide (137Cs) and
natural radionuclide for dose rate assessment due to their significant contribution to the total
annual effective dose rate estimated in the study.

Main title:Studies of the transfer of radionuclides and dose rate assessments in the pasture lands located in the counties of Uppsala and Jämtland
Authors:Tesfatsion, Yosief
Supervisor:Gutierrez Villanueva, Jose Luis
Examiner:Rosén, Klas
Series:Institutionen för mark och miljö, SLU, Examensarbeten
Volume/Sequential designation:2012:06
Year of Publication:2012
Level and depth descriptor:Second cycle, A2E
Student's programme affiliation:NM001 Environmental Pollution and Risk Assesment - Master's Programme 120 HEC
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Keywords:radionuclides, dose rate, transfer factor, migration, Chernobyl accident
URN:NBN:urn:nbn:se:slu:epsilon-s-1154
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-s-1154
Subjects:Agriculture - General aspects
Soil science and management
Soil chemistry and physics
Language:English
Deposited On:24 May 2012 10:30
Metadata Last Modified:24 May 2012 10:30

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