Determination of the time-dependent OH-yield by using a fluorescent probe; Application to heavy ion irradiation

Baldacchino, G.*; Maeyama, Takuya*; Yamashita, Shinichi; Taguchi, Mitsumasa; Kimura, Atsushi; Katsumura, Yosuke; Murakami, Takeshi*

This paper reports a sensitive method using HPLC-fluorescence detection of $^{bullet}$ OH in liquid water under high-energy heavy-ion irradiation. The coumarin-3-carboxylic-acid (3CCA) molecule was selected for probing $^{bullet}$ OH and providing the fluorescent 7-hydroxy-coumarin-3-carboxylic-acid (7OH-3CCA). Since the concentration limit achievable is better than 1 nM, the radiolytic yields were determined with a sensitivity of 210 $^{-9}$ mol/J for 4.8-GeV- $^{12}$ C $^{6+}$ of and 20-GeV- $^{40}$ Ar $^{18+}$ in the ns time-range. They decrease with the linear energy transfer from 2.810 $^{-7}$ to 1.310 $^{-7}$ mol/J ( $^{12}$ C $^{6+}$ of 11 eV/nm) and 1.510 $^{-7}$ to 0.910 $^{-7}$ mol/J ( $^{40}$ Ar $^{18+}$ of 90 eV/nm) which is in agreement with the literature data.

Language	:	English
Journal	:	Chemical Physics Letters
Volume	:	468
Number	:	4-6
Pages	:	p.275 - 279
Publication Year/Month	:	2009/01
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Paper URL	:	https://doi.org/10.1016/j.cplett.2008.12.006
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Keywords	:	no keyword
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Cooperating Institute	:	CEA; 放射線医学総合研究所; 東京大学

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Registration No. : AA20080721
JAEA Abstracts No. :
Paper Submission No. : 11088

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