Changes in the distribution of radiocesium in the wood of Japanese cedar trees from 2011 to 2013

Journal of Environmental Radioactivity
Hideki OgawaHirohisa Yoshida

Abstract

The changes in the distribution of (137)Cs in the wood of Japanese cedar (Cryptomeria japonica) trunks within three years after the Fukushima Dai-ichi Nuclear Power Plant (FDNP) accident in 2011 were investigated. Thirteen trees were felled to collect samples at 6 forests in 2 regions of the Fukushima prefecture. The radial distribution of (137)Cs in the wood was measured at different heights. Profiles of (137)Cs distribution in the wood changed considerably from 2011 to 2013, and the process of (137)Cs distribution change in the wood was clarified. From 2011 to 2012, the active transportation from sapwood to heartwood and the radial diffusion in heartwood proceeded quickly, and the radial (137)Cs distribution differed according to the vertical positon of trees. From 2012 to 2013, the vertical diffusion of (137)Cs from the treetop to the ground, probably caused by the gradient of (137)Cs concentration in the trunk, was observed. Eventually, the radial (137)Cs distributions were nearly identical at any vertical positions in 2013. Our results suggested that the active transportation from sapwood to heartwood and the vertical and radial diffusion in heartwood proceeded according to the vertical position of the tree and (137)Cs dis...Continue Reading

References

Dec 10, 2002·Journal of Environmental Quality·Akira KagawaYukio Katayama
Apr 10, 2003·Journal of Environmental Radioactivity·N V SoukhovaP M Badot
Jun 15, 2010·Journal of Environmental Radioactivity·Miglena ZhiyanskiViktor Badulin
May 6, 2011·Radiation Protection Dosimetry·Satoshi YoshidaAkira Suzuki

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Citations

Oct 13, 2020·The Science of the Total Environment·Naohiro ImamuraTakuya Manaka
Jun 23, 2020·Journal of Environmental Radioactivity·Dmytrii HoliakaValery Kashparov

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