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Fig. 6

(Color online) Schematics of inner­sphere and outer­spherecomplexes of (a) Cs{ and (b) Ca2{ adsorbed on 2:1 phyl­
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orbed on (c) soil and (d) river sediment samples collected in
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data, respectively.

Fig. 8

Sequential extraction of Cs adsorbed on soil and sedimentcollected in Fukushima. F1: exchangeable ions leached by
the addition of 1.0 M NaCl (pH 7.0); F2: carbonate phaseleached by 0.11 M acetic acid; F3: reducible phase leached by
0.50 M NH2OHÉHCl; F4: organic phase leached by 8.8 M
H2O2 (pH 2.0 with HNO3); F5: residue (insoluble phase).

Fig. 9(Color online) Schematic of inhibition of adsorption of
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úËõ Jan. 2014 Vol.27 No.1  27

An X­ray spectroscopy study on the migration
processes of radiocesium and radioiodine
at land surface
Yoshio TAKAHASHI1, Qiaohui FAN1, Yoko TOGO2,
Aya SAKAGUCHI1 and Kazuya TANAKA3
1Dept. Earth and Planetary Systems Sci., Graduate School of Sci., Hiroshima Univ.
2National Institute of Advanced Industrial Science and Technology

3Institute for Sustainable Sciences and Development, Hiroshima University

Abstract

Radionuclides, such as radiocesium and radioiodine, released from the Fukushima Daiichi Nuclear
Power Plant (FDNPP) accident have been migrating controlled by various chemical processes inenvironment. On land surface, radionuclides deposited from atmosphere have moved under the in­uence of chemical eects of water and soil particles. X­ray absorption ne structure (XAFS)
spectroscopy using synchrotron radiation is a powerful tool to understand the elementary
processes of the migration, which has been employed in other studies on the migration and chemi­
cal processes of toxic elements. To estimate the behavior of radionuclides, however, the moleconcentration of radionuclides is too low to be detected by such direct speciation method, even if
the radioactivities are very high. Hence, it is essential to couple (i) classical methods such as dis­tribution of radionuclides by radiochemical method and sequential extraction technique and (ii)spectroscopic method written above to compensate these two approaches each other. Based on
the multiple analyses, it was found that (i) radiocesium is strongly adsorbed on phyllosilicate and(ii) radioiodine is eectively incorporated into humic substances in Fukushima soil, which can be abasis to understand their migration behaviors in land area.

28  úËõ Jan. 2014 Vol.27 No.1