Sequential radiation chemical reactions in aqueous bromide solutions; Pulse radiolysis experiment and spur model simulation

Yamashita, Shinichi*; Iwamatsu, Kazuhiro; Maehashi, Yuki*; Taguchi, Mitsumasa; Hata, Kuniki; Muroya, Yusa*; Katsumura, Yosuke*

RSC Advances (Internet), 5(33), p.25877 - 25886, 2015/02

https://doi.org/10.1039/C5RA03101J

Pulse radiolysis experiments were carried out to observe transient absorptions of reaction intermediates produced in NO and Ar-saturated aqueous solutions containing 0.9-900 mM NaBr. The most important species among the reaction intermediates are BrOH and Br , which commonly have absorption peaks around 360 nm. The experimental results were compared with the results of simulation based on a spur diffusion model. Each of several complicated sequential radiation-induced chemical reactions was carefully considered, optimizing its rate constant within a range of reported values. All the experimental results were able to be universally reproduced by the simulation, assuming a reaction not yet reported, 2BrOH Br + 2OH, with a rate constant of 3.8 10 M s, which is significant only within 10 micro-s for rather high bromide concentrations ( 10 mM). Primary values, which are yields after sufficient diffusion from the spur to the perimeter region during 100 ns, of major water decomposition products, as well as of the reaction intermediates, were calculated for NO and Ar-saturated conditions as a function of NaBr concentration.

Present status and future subjects of the analytical studies related with application of charged particles and RI to materials science and biotechnology

Working Group in the Advisory Committee of the Analytical Studies for Application of Charged Particl

JAERI-Review 2003-008, 42 Pages, 2003/03

JAERI-Review-2003-008.pdf:3.12MB

The position in the research field of radiation application of "Theoretical Analysis Group for Radiation Application" which will be set up within fiscal 2003, and the relation between the research that this analytical group will advance in future and the analytical research made so far at JAERI Takasaki are summarized. First, the theoretical analysis group for radiation application extracts only the core element from the analysis of reactive process of charged particles in the materials and from the irradiation effect, and then constructs the simplified model. Second, the validity of the constructed model is verified by advancing the theoretical analysis based on the model, and the calculated result is fed back to the experiment, and then the verification is carried out. Finally, the general-purpose theorization will be conducted by generalizing and universalizing the obtained model concerning the specific system. The obtained outcomes will be applied to other systems, and, will consequently, contribute to the promotion of new technological development.

REACT-Mod: A Mathematical model for transient calculation of chemical reactions with U-Pu-Np-Tc in the aqueous nitric acid solution

Tachimori, Shoichi; *

JAERI-Data/Code 96-030, 116 Pages, 1996/10

JAERI-Data-Code-96-030.pdf:2.45MB

no abstracts in English

Radiation-induced chemical reaction of methane in the presence of X- and Y-type molecular sieves

Shimizu, Yuichi; Nagai, Shiro

Radiation Physics and Chemistry, 36(6), p.763 - 766, 1990/00

https://doi.org/10.1016/1359-0197(90)90175-H

no abstracts in English

Physical and chemical behaviors of radioiodine in atmospheres from degraded core to environment following nuclear reactor accident

Hoken Butsuri, 22, p.189 - 207, 1987/00

https://doi.org/10.5453/jhps.22.189

no abstracts in English

Study of low temperature chemistry and fabrication of nuclear-spin polarized sample using radiation beam

Kumada, Takayuki

no journal, , 

no abstracts in English