RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
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Volume 60, Issue 5
Displaying 1-3 of 3 articles from this issue
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Article
  • Isotopic Characteristics of Hydrogen and Oxygen for Groundwater of Nansei Islands, Japan
    Seizen AGATA, Hiroshi SATAKE, Jing ZHANG
    2011 Volume 60 Issue 5 Pages 203-213
    Published: 2011
    Released on J-STAGE: May 28, 2011
    DOIhttps://doi.org/10.3769/radioisotopes.60.203
    JOURNAL OPEN ACCESS
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    Isotopic compositions of groundwaters from 13 islands of the Nansei Islands were determined. Mean δD and δ18O values for each island are, respectively, −31 – −20‰ and −5.8 – −4.5‰, decreasing concomitantly with increasing latitude. The oxygen isotopic latitude effect on the groundwaters of the Nansei Islands is estimated as −0.14‰/degree latitude. The temperature effect for δ18O is estimated as 0.20‰/°C. The altitude effect of sampling locations is −0.1‰/100m for δ18O in Yakushima(elevation 1935m). The monthly δD and δ18O values of collected seepage waters from Omoto Tunnel in Ishigaki Island are almost constant for this observation period. Their isotopic composition indicates that precipitation is well mixed during infiltration into the groundwater. The d-parameters for summer precipitation of all islands are almost identical(about 10). However, in winter, the d-parameters(>25) for the northern islands(Tanegashima, Yakushima, and Nakanoshima) were higher than those(<22) for the southern islands.
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  • Behavior of Water of Crystallization in CuSO4·5H2O Studied by The Tritium Tracer Method
    Tetsuya SATO, Yurong JIAO, Hiroshi IMAIZUMI, Naoki KANO
    2011 Volume 60 Issue 5 Pages 215-219
    Published: 2011
    Released on J-STAGE: May 28, 2011
    DOIhttps://doi.org/10.3769/radioisotopes.60.215
    JOURNAL OPEN ACCESS
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    Tritium (T) is one of hydrogen isotopes, and its chemical behavior is similar to other hydrogen isotopes. Therefore tritium is used as one of tracers in chemical experimental tracer. As one of applications, we tried to apply this method to clarifying the behavior of water of crystallization in an inorganic material. The sample used was copper sulfate pentahydrate. First, this compound was tritiated, then desorbed the water of crystallization from the tritiated compound. Comparing the behavior of amount of substance with the specific activity, the following four matters have been found. (1) There is no relation between each T concentration of HTO water and the mass of the compound within the T concentration used. (2) It can be confirmed that copper sulfate pentahydrate has three kinds of energetically different water of crystallization by T tracer method. (3) Each T concentration of water of crystallization is different at the coordinate position, and the HTO molecule is hard to coordinate at the position having weak binding force. (4) The T tracer method is useful to analyze the behavior of the combined water in materials.
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