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Taguchi, Mitsumasa; Kojima, Takuji
JAEA-Review 2005-001, TIARA Annual Report 2004, p.181 - 182, 2006/01
The yields of OH radicals in water containing phenol have been investigated for several ten MeV/n C ion and Ne ion having the same LET value, as a function of the residual ion energy at the specific depth in water. In this study, beside such energy dependence, the dependence of reaction time of OH radical yield was examined by changing the concentration of phenol as solute. The defferential G'-values of OH radicals, those G-values per kinetic energy of ions increase with specific energy of Ne ions. The G'-value just after irradiation(1.5ns) is relatively high but become lower with reaction time to be the value (2.7) obtained for 
Co 
-rays. It suggests the diffusion behavior of OH radicals locally induced in water.
X.Huang*; Arai, Hidehiko; Matsuhashi, Shimpei; Miyata, Teijiro
Chemistry Letters, 0(2), p.159 - 160, 1996/00
no abstracts in English
X.Huang*; Arai, Hidehiko; Matsuhashi, Shimpei; Miyata, Teijiro
Chemistry Letters, 0(4), p.273 - 274, 1996/00
no abstracts in English
; ; *; *; ; Machi, Sueo
J.Appl.Polym.Sci., 27, p.1043 - 1051, 1982/00
Times Cited Count：90 Percentile：96.13(Polymer Science)no abstracts in English
Ono, Shinichi
Bulletin of the Chemical Society of Japan, 40(9), p.2039 - 2042, 1967/00
Times Cited Count：6no abstracts in English
, He
, C
and Ne
ionsIwamatsu, Kazuhiro; Yamashita, Shinichi*; Taguchi, Mitsumasa; Kimura, Atsushi; Kurashima, Satoshi; Katsumura, Yosuke
no journal, ,
Heavy ion beams, one of the high linear energy transfer (LET) radiations induce specific irradiation effects which are different from those of low LET radiations. The effects are attributed to heterogeneous distribution of reactive species along their trajectories, so called "track structure". Water was selected as target in this study because more data exist for radiolysis than any other substances. Hydroxyl radical (OH), one of the most important water decomposition species, was focused on by using bromide ion as a probing reagent, and their reactions were observed by the ion beam pulse radiolysis system. The formation and decay of Br
were observed at 375 nm (
[Br] = 9000 M
cm). The formation chemical yield of it after pulse irradiation decreased with increasing atomic numbers of the incident ions. Radical recombination reaction occurs easier by higher LET ions because of denser radical formations. Therefore, the decrease in the yields of OH scavenged by Br induces the decrease in the chemical yields of Br. The decay rates of the chemical yields increased with the atomic mass of the ions. The concentrations depend on the dose rate and chemical yield, and the dose rates proportional to LET value. The concentrations after pulse increased with increase in the atomic mass of the ions and resulted in faster decay in heavier ions.
Hirade, Tetsuya
no journal, ,
Reaction of radiation-induced OH radicals in water is important for radiation effects in living organisms and in nuclear reactors. It is considered that the OH radical forms a complex with water molecules. The hyperfine coupling constants of the states of the OH radical with and without one water molecule in gas phase were obtained by supersonic jet. The hyperfine coupling constant of the OH radical changes largely by forming the complex. The Detection of the complex showing the hyperfine coupling constant of 155.3 MHz in liquid water was tried and successfully measured the state showing a well-matched value. Quantum beats showing the hyperfine coupling constant of OH radicals alone, 73.25 MHz, showed the possibility of varying in value due to the influence of surrounding water molecules in water.
