RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
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Volume 66, Issue 6
Displaying 1-3 of 3 articles from this issue
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Articles
  • Characteristics of Air GM Counter with Needle Anode Suitable for Radiation Education Experiment
    Chizuo Mori, Takahiko Aoyama, Takao Iida, Hitoshi Kamiya, Yutaka Sagou ...
    2017 Volume 66 Issue 6 Pages 207-216
    Published: June 15, 2017
    Released on J-STAGE: June 15, 2017
    DOIhttps://doi.org/10.3769/radioisotopes.66.207
    JOURNAL OPEN ACCESS
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    A new GM counter was developed, which used air as counting gas, ethanol vapor as quenching gas, darning needle as anode, and plastic case with conductive paper as cathode. The characteristics of the performance of this counter were investigated by the calculation of gas gain together with equipotential curves around the needle tip and by the experimental results such as plateau curves and detection efficiencies depending on the incident position of β-rays into the counter and on the distance from the window to the needle tip. This counter is very easy to fabricate and has stable counting performance. It is therefore useful for radiation education experiments.

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  • Some Science Experiments using Air-Filled Needle-Anode GM Counter by Inserting Various Specimens Inside
    Chizuo Mori, Takahiko Aoyama, Takao Iida, Hitoshi Kamiya, Yutaka Sagou ...
    2017 Volume 66 Issue 6 Pages 217-226
    Published: June 15, 2017
    Released on J-STAGE: June 15, 2017
    DOIhttps://doi.org/10.3769/radioisotopes.66.217
    JOURNAL OPEN ACCESS
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    Handmade air-filled GM counter with a darling needle anode can be inserted various specimens inside. Some experiments with this counter can be performed such as alpha-particle absorption, photoelectron emission, and exo-electron emission. A new concept based upon oxidation of metal surface layers has been introduced to explain the decrease of the count-rate of photoelectrons with time. The experimental results revealed some examples of useful applications of such a type of air-filled GM counter even for science education in addition to nuclear science education.

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Materials (Data)
  • Distribution of Natural γ Ray Dose Rates in a Beach-Dune System —A Case Study of the Tottori Dune—
    Susumu Minato, Tadashi Ikeda
    2017 Volume 66 Issue 6 Pages 227-234
    Published: June 15, 2017
    Released on J-STAGE: June 15, 2017
    DOIhttps://doi.org/10.3769/radioisotopes.66.227
    JOURNAL OPEN ACCESS
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    Natural γ ray dose rates were measured at 94 points in the Tottori Dune coast located in Tottori City, Tottori Prefecture. The dose rate increased gradually from the shoreline to the end of the beach, and revealed an approximately constant value on the slope and the entire area of the dune. As a result of spectrum measurements there, although the concentrations of both potassium and uranium in the beach amounted to almost the same levels as those in the dune, the concentrations of thorium in the dune were high compared to those in the beach. The peculiarity and commonality in natural γ ray dose rate distribution in each beach-dune system were described by comparing with the cases of three dunes in the Enshu-nada coast measured so far.

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