Radical Formation of Lithium and Magnesium Citrates for Electron Spin Resonance Dosimetry
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概要
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Lithium citrate (Li_3C_6H_5O_7: (CH_2COOLi)_2C(OH)COOLi); Li-citrate) and magnesium citrate (Mg_3(C_6H_5O_7)_2: Mg_2(CH_2COO)_4Mg(C(OH)COO)Mg; Mg-citrate) were irradiated by γ-rays to study radicals with electron spin resonance (ESR). A doublet spectrum has g=2.0044±0.0005 and hyperfine splitting of A/gβ =2.5±0.2 mT in Li-citrate. Mg-citrate shows a triplet spectrum with g=2.0032±0.0004 and hyperfine splitting of A/gβ=2.21±0.18 mT. The energy level, g-factor, A/gβ and optical absorption spectra of several radicals have been calculated using software of MOPAC-V2 and Gaussian-98 based on the unrestricted Hartree-Fock: (UHF). Abstraction of hydrogen from -CH_2 is expected for Li-citrate, and homolytic cleavage of the OH group is expected for Mg-citrate. The powders of both Li-citrate and Mg-citrate are six times and five times more sensitive to the γ-ray dose, respectively than a commercial alanine dosimeter. The numbers of free radicals per 100eV (G-values) were 0.77±0.25 and 1.11±0.35 for Li-citrate and Mg-citrate, respectively.
- 社団法人応用物理学会の論文
- 1999-12-15
著者
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Hassan G
Osaka Univ. Osaka Jpn
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UESUGI Akihiko
Department of Earth and Space Science, Graduate School of Science
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Ikeya Motoji
Department Of Earth And Space Science Faculty Of Science Osaka University
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Hassan Gamal
Department Of Earth And Space Science Graduate School Of Science Osaka University
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Uesugi Akihiko
Department Of Earth And Space Science Graduate School Of Science Osaka University
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