Speaker
Prof.
Haruo Sato
(Okayama University)
Description
H. Sato and M. Yoshii, Okayama University, 3-1-1, Tsushima-naka, Kita-ku, Okayama-shi, Okayama 700-8530, Japan
The accident at the Fukushima Daiichi Nuclear Power Plant occurred following the Great East Japan Earthquake in March 2011, and led to the release of volatile radionuclides (RNs) which were deposited on the surrounding environment in the Fukushima prefecture. The authors conducted twice investigations on the depth profiles of RNs in soil at 11 locations in the city of Nihonmatsu and the towns of Kawamata and Namie.
The apparent diffusion coefficients (Da) of Cs-134 and Cs-137 were derived from changes in the depth profiles, and the distribution coefficients (Kd) also calculated from the relation with Da. The calculated Kd-values ranged 1E4-1E5 ml/g, which were consistent with Kd-values (2,080-61,000 ml/g) obtained by a batch method. The Da-values of both nuclides were approximately of order 1E-14 m2/s and movement by diffusion was very slow. Furthermore, the authors simulated change in the depth profiles of both nuclides for 30 years following the accident.
Primary author
Prof.
Haruo Sato
(Okayama University)
Co-author
Mr
Masato Yoshii
(Okayama University)
