ExperimentaI studies for sorption behavior of Tin on bentonite and rocks, and diffusion behavior of Tin in compacted bentonite

Oda, Chie; Ikeda, Takao*; Shibata, Masahiro

JNC TN8400 99-073, 112 Pages, 1999/11

JNC-TN8400-99-073.pdf:2.79MB

In the safety assessment for geological disposal of high-level radioactive wastes (HLW), distribution coefficients (Kd) and diffusion coefficients of radionuclides are used to estimate the migration of radionuclides in a near-field of repository. Sn is one of the important nuclides for the safety assessment in Japan and its behavior under reopsitory conditions has not been understood. This report provides the experimental informations for the sorption of Sn on bentonite, tuff and granodiorite, and the diffusion of Sn in a compacted bentonite. The Kd values of Sn on bentonite, tuff and granodiorite were determined by the batch-type sorption experiments as l010[ml/g], 1010[ml/g] and 10 10[ml/g], respectively. The sequential extraction experiments for adsorbed Sn on bentonite were also performed to investigate its desorption behavior. These experimental results indicated that the mechanisms of sorprion onto bentonite were dominated by the sorption reactions on smectite and pyrite and consisted of reversible and irreversible sorption on solid and stable fixation in solid. On the other hands, the apparent diffusion coefficients (Da) in compacted bentonite were measured by the diffusion experiments as 10[m/sec] and l0 [m/sec] for dry densities of 0.4[g/cm] and 1.0[g/cm], respectively. Moreover, the Kd values in compacted bentonite were calculated according to the relationship with the measured Da values, and the solubilities in the porewaters of compacted bentonite were calculated by use of the calculated Kd and the obtained diffusion plofiles. It is found that the derived solubilities almost agreed with the solubiliies of amorphis SnO reported by Amaya et al. (1997), however, the derived Kd values were lower than that measured from the batch-type sorption experiments.

Data of atmospheric diffusion experiments (Tsukuba, 1989)

Hayashi, Takashi; Chino, Masamichi; Yamazawa, Hiromi; Moriuchi, Shigeru*; Ishikawa, Hirohiko*; Adachi, Takashi*; Kojima, Hiromi*

JAERI-Data/Code 99-036, 322 Pages, 1999/08

JAERI-Data-Code-99-036.pdf:14.37MB

no abstracts in English

Data of long term atmospheric diffusion experiments; Summer, 1992

Hayashi, Takashi; Chino, Masamichi; Yamazawa, Hiromi; Nagai, Haruyasu; Moriuchi, Shigeru*; Ishikawa, Hirohiko*; Adachi, Takashi*; Okano, Hiroshi*; Kojima, Hiromi*; Odagawa, Fumiaki*

JAERI-Data/Code 98-028, 282 Pages, 1998/10

JAERI-Data-Code-98-028.pdf:14.47MB

no abstracts in English

Data of long term atmospheric diffusion experiments; Autumn, 1991

Hayashi, Takashi; Chino, Masamichi; Yamazawa, Hiromi; Nagai, Haruyasu; Moriuchi, Shigeru*; Ishikawa, Hirohiko*; Adachi, Takashi*; Okano, Hiroshi*; Kojima, Hiromi*; Odagawa, Fumiaki*

JAERI-Data/Code 98-026, 347 Pages, 1998/10

JAERI-Data-Code-98-026.pdf:16.47MB

no abstracts in English

European tracer experiment and worldwide version of system for prediction of environmental emergency dose information

Yamazawa, Hiromi

Hoken Butsuri, 32(1), p.71 - 79, 1997/00

https://doi.org/10.5453/jhps.32.71

no abstracts in English

Analysis and numerical simulation of field tracer experiments around Mt.Tsukuba

Yamazawa, Hiromi

Tenki, 39(10), p.605 - 613, 1992/10

http://ci.nii.ac.jp/naid/10006232605

no abstracts in English

Data of very Low Wind Speed and of Air Tracer Cocentration in the Diffusion Experiments under Very Stable Condition

JAERI-M 84-068, 122 Pages, 1984/05

JAERI-M-84-068.pdf:5.67MB

no abstracts in English

Slowing down and diffusion measurements bu pulsed neutron techniques

;

Nihon Genshiryoku Gakkai-Shi, 3(8), p.634 - 650, 1961/00

https://doi.org/10.3327/jaesj.3.634

no abstracts in English