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Fig. 1(Color online) The 2 : 1 sheet structure (left) of clay mineral and the hour dominant sorption sites of 2 : 1 typeclay mineral (right).
The sorption sites were mentioned to be three in the text; however, collapsed (3.) and swelled (4.) layers were dis­tinguished in this gure.

Fig. 2(Color online) The tetrahedral (left) and octahedral (right) sheets of clay minerals.

316  úËõ Nov. 2014 Vol.27 No.6

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318  úËõ Nov. 2014 Vol.27 No.6

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Fig. 6(Color online) Calculation models of Cs­muscovite system.

úËõ Nov. 2014 Vol.27 No.6  319

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ed solutions15).
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ppm, sample 2: 5 ppm, sample 3: 20 ppm, sample 4: 100
ppm, sample 5: 1000 ppm.

Fig. 10Structural changes in the crystal domain of vermiculite. N
with the error plotted as a function of WCs (absorbed Cs
weight) on logarithmic scalesr15). Dashed lines is a visual
guide and single exponential function, exp(­WCs/WCsÞ),respectively. Errors in Di in the numerical SAXS analyses
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ÇÌªÍÉæéSyz¨Ì Cs Ì¶ÝóÔ¨æÑIð«320  úËõ Nov. 2014 Vol.27 No.6

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Â«¡úË«õ¨¿îñTCgChttp://shiteihai­
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´Ù©FúËõ 27, 20 (2014).
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îÂCrcC¼ºFATOMOS 56, 366 (2014).

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úËõ Nov. 2014 Vol.27 No.6  321

Cs adsorption mechanism on clay minerals basedon material sciences using synchrotron radiationand first principle calculation
Tsuyoshi YAITA

Quantum Beam Science Center, Japan Atomic Energy Agency, 1_1_1 Kouto,Syo­cho, Sayo­gun, Hyogo 679_
5148

Toru KOBAYASHI

Quantum Beam Science Center, Japan Atomic Energy Agency, 1_1_1 Kouto,Syo­cho, Sayo­gun, Hyogo 679_
5148

Takashi IKEDA

Quantum Beam Science Center, Japan Atomic Energy Agency, 1_1_1 Kouto,Syo­cho, Sayo­gun, Hyogo 679_
5148

Daiju MATSUMURA

Quantum Beam Science Center, Japan Atomic Energy Agency, 1_1_1 Kouto,Syo­cho, Sayo­gun, Hyogo 679_
5148

Masahiko MACHIDA

Center for Computational Science & e­Systems, Japan Atomic Energy Agen­cy, Kashiwanoha Campus 148_
4, 178_4 Wakamurasaki, Kashiwa­shi, Chiba
277_0871

Masahiko OKUMURA

Center for Computational Science & e­Systems, Japan Atomic Energy Agen­cy, Kashiwanoha Campus 148_
4, 178_4 Wakamurasaki, Kashiwa­shi, Chiba
277_0871

Hiroki NAKAMURA

Center for Computational Science & e­Systems, Japan Atomic Energy Agen­cy, Kashiwanoha Campus 148_
4, 178_4 Wakamurasaki, Kashiwa­shi, Chiba
277_0871

Abstract

The radioactive Cs released from Fukushima Dai­ichi Nuclear Power Plant accident is one of theimportant sources to increase air dose rate in environment, and thus the local and Japanese
governments are still promoting the decontamination project in the contaminated area in Fukushi­
ma. On this backgrounds, in this study, ``the comprehensive researches'', i.e., the elucidation of
Cs speciation through the structural and electronic structural studies in clay minerals for support­
ing to develop the promising volume reduction methods of soil wastes (we will not touch thechemical treatment, wet classification, incineration, and alkaline fusion methods in this article)
and the evaluation of Cs stability in soil wastes over mid­ to long­term period, and the field investi­
gation for elucidation of seasonal variation of bottom soil of agricultural reservoir in Iitate village
on considering the features of local soil in Fukushima, have been performed. In this article, we in­troduce a part of the results obtaining by the synchrotron based X­ray analysis and the first princi­
ple molecular dynamics simulation methods.

322  úËõ Nov. 2014 Vol.27 No.6