RADIOISOTOPES

Reactivity of Aliphatic Dicarboxylic Acids in Hydrogen-Isotope Exchange Reaction

Dongyu ZHAO, Hiroshi IMAIZUMI, Takehisa KATO, Hideyuki SAKAI, Naoki KA ...

2003 Volume 52 Issue 5 Pages 215-223
Published: May 15, 2003
Released on J-STAGE: March 01, 2011

DOIhttps://doi.org/10.3769/radioisotopes.52.215

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In order to reveal the reactivity of aliphatic dicarboxylic acids, the hydrogen-isotope exchange reaction (T-for-H exchange reaction) between poly (vinyl alcohol) labeled with tritium at hydroxy group and one of aliphatic dicarboxylic acids in 1, 4-dioxane has been observed in a liquid-solid system in the range from 30 to 90°C. It was consequently found that (1) the greater the number of methylene groups in a aliphatic dicarboxylic acid is, the smaller is the reactivity of the acid; (2) a large difference is found between the reactivity of acids having even numbers of methylene groups and those having odd numbers, and the reactivity of the former is generally larger than that of the latter; (3) relating to the decrease of the reactivity of the acids with increasing number of methylene groups, the rate of the decrease in the case of even numbers is smaller than in the case of odd ones; (4) the reactivity of aliphatic dicarboxylic acids in T-for-H exchange reaction is largely dependent on the configuration (e.g., cisoid or transoid) of the two COOH groups.

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An Electron Spin Resonance Study of γ-Ray Irradiated Pepper

Mitsuko UKAI, Naruki HAMAYA, Akane ICHII, Aika ABE

2003 Volume 52 Issue 5 Pages 224-230
Published: May 15, 2003
Released on J-STAGE: March 01, 2011

DOIhttps://doi.org/10.3769/radioisotopes.52.224

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Using electron spin resonance (ESR) spectroscopy, we revealed four radical species in the irradiated pepper. The representative ESR spectrum of the pepper is composed of a sextet centered at g=2.0, a singlet at the same g-value, a singlet at g=4.0 and side peaks near g=2.0. The first one is attributable to a signal with hyperfine (hf) interactions of Mn²⁺ ion (hf constant= 7.4 mT) . The second one is due to an organic free radical that may be induced by the (γ-ray irradiation. The third one may be originated from Fe³⁺ ion in the non-hem proteins. Those three signals were found in the pepper sample before irradiation. The fourth signals were found at the symmetric position of the organic free radical, i.e, the second signal. The progressive saturation method of the ESR microwave power indicated quite different relaxation behaviors of those radicals. The method reflects four independent radical species in the irradiated pepper. Relaxation time for the singlet signal centered at g=2.0 revealed that the signal is due to the typical organic free radical.

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Influence of Temperature on the Radiation Dosimeter (II)

-OSL Dosimeter, Glass Dosimeter-

Yoshihiro TAHARA, Keiichi KAWAI, Takashi NAKAMURA, Toshio GOTO, Shozo ...

2003 Volume 52 Issue 5 Pages 231-234
Published: May 15, 2003
Released on J-STAGE: March 01, 2011

DOIhttps://doi.org/10.3769/radioisotopes.52.231

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The current study was performed to investigate the influence of high temperature on the value of radiation dose measured by optically stimulated liminescence (OSL) dosimeter or radio photo luminescence (RPL) dosimeter (glass dosimeter) . Serial measurements of temperature in the car confirmed that it can rise to 80°C or higher in the area irradiated with sun beam. The relationship between the temperature and the radio dose measured by X-ray irradiated OSL dosimeter or glass dosimeter under the condition from 50°C to 90°C after the set of 3h. to 72h.
The value measured by OSL dosimeter tended to be lower with higher temperature or longer setting time. On the other hand, those factors did not influence the value measured by glass dosimeter.

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Tritium Concentration in River Water at Toki Area

Hirokuni YAMANISHI, Yoichi SAKUMA, Haruo OBAYASHI

2003 Volume 52 Issue 5 Pages 235-241
Published: May 15, 2003
Released on J-STAGE: March 01, 2011

DOIhttps://doi.org/10.3769/radioisotopes.52.235

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Tritium concentrations in river water have been measured at Toki area (Toki-shi, Gifu-ken, Japan) since 1982. The tritium concentrations decreased exponentially, and their apparent half-lives were distributed between 2.3 and 7.2 year. It is suggested that the time during which rainwater changes to groundwater and is discharged again as river water is different at spot by spot. As a result of comparison with yearly variations of flow rate, a inverse correlation was recognized between tritium concentration and flow rate in some spots.

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Mössbauer Spectrometry Using Synchrotron Radiation

- (I) Nuclear Resonant Inelastic Scattering-

Kiyoshi NOMURA

2003 Volume 52 Issue 5 Pages 242-256
Published: May 15, 2003
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.52.242

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Usefulness of PET in Medical Check up System

Michiru IDE

2003 Volume 52 Issue 5 Pages 257-261
Published: May 15, 2003
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.52.257

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Instruments for Radiation Measurement in Life Sciences (4)

III. Quantitative Analysis of ¹⁴C in Biological Samples by Using Accelerator Mass Spectrometry

Shin-ichiro NAGATSUKA

2003 Volume 52 Issue 5 Pages 262-268
Published: May 15, 2003
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.52.262

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