Depth
distribution of 137Cs, 134Cs, and 131I in soil
profile after Fukushima Daiichi Nuclear Power
Plant Accident Original Research
Article
Journal of Environmental Radioactivity, In Press, Corrected Proof, Available online 26 October 2011
Hiroaki Kato, Yuichi Onda, Mengistu Teramage
Journal of Environmental Radioactivity, In Press, Corrected Proof, Available online 26 October 2011
Hiroaki Kato, Yuichi Onda, Mengistu Teramage
[excerpts from conclusion]
In
this study, we investigated the depth distribution of deposited radionuclides
after the FDNPP accident triggered by a magnitude 9.0 earthquake and the
resulting tsunami on 11 March 2011. Sectioned soil samples were taken from a
home garden located in the Kawamata Town, in the northern part of Fukushima
Prefecture.
The
depth distribution of deposited radionuclides in the soil profile indicated that approximately 80% of the deposited
radiocaesium and 131I were absorbed by the surface soil within the upper 2.0
cm. The relaxation mass depth (h0) derived from the depth distribution of 137Cs, 134Cs, and 131I
in the soil profile at
the study site were 9.1 kg m_2,
9.1 kg m_2 and 10.4 kg m_2, respectively.
The penetration depth
of 131I was slightly greater than that of radiocaesium. The h0 of 137Cs in the studied soil profile was greater than those for the cultivated soil nearby the
Chernobyl NPP.
A positive relationship was found between clay content of
topsoil and the h0 of 137Cs.
It was suggested that high clay content increased aggregate stability
of topsoil, consequently increasing water infiltration and 137Cs transportation into deeper horizon of the
soil profile.
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