Improvement of charge resolution for high Z/β particles in CR-39 nuclear track detectors by means of two-step etching technique

S. Kodaira, S. Naka, N. Yasuda, H. Kawashima, M. Kurano, S. Ota, Y. Ideguchi, Nobuyuki Hasebe, K. Ogura

    研究成果: Article

    10 引用 (Scopus)

    抄録

    We verified that the two-step etching method of the combination of pre-etching with PEW (Potassium hydroxide + Ethanol + Water) solution and post-etching with NaOH solution makes drastic improvement of charge resolution for high Z/β particles (Z: nuclear charge, β: velocity) in CR-39 nuclear track detectors. Detectors were exposed to several heavy ions from Ne to Kr with the energies of <500 MeV/n at HIMAC (Heavy Ion Medical Accelerator in Chiba). The optimum etching conditions were determined to be a pre-etching of PEW solution with concentration of 60 wt% of ethanol for 40 min and a post-etching of 7N NaOH for 12 h. This resulted in a charge resolution for Kr (Z/β ∼ 60) of 0.18 c.u. (charge units). The Z/β detection threshold was increased as a function of ethanol concentration in PEW pre-etching solutions. We found that the two-step etching method would be useful technique for the precise charge identification by a single track measurement. The 60 wt% ethanol concentration in PEW would be adequate selection for the purpose of trans-iron nuclei measurement discriminating abundant light nuclei in galactic cosmic rays.

    元の言語English
    ページ(範囲)36-41
    ページ数6
    ジャーナルNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
    274
    DOI
    出版物ステータスPublished - 2012 3 1

    Fingerprint

    Etching
    etching
    Ethanol
    ethyl alcohol
    Detectors
    potassium hydroxides
    Potassium hydroxide
    detectors
    Heavy ions
    water
    Water
    heavy ions
    nuclei
    Cosmic rays
    Particle accelerators
    accelerators
    Iron
    iron
    thresholds

    ASJC Scopus subject areas

    • Instrumentation
    • Nuclear and High Energy Physics

    これを引用

    Improvement of charge resolution for high Z/β particles in CR-39 nuclear track detectors by means of two-step etching technique. / Kodaira, S.; Naka, S.; Yasuda, N.; Kawashima, H.; Kurano, M.; Ota, S.; Ideguchi, Y.; Hasebe, Nobuyuki; Ogura, K.

    :: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, 巻 274, 01.03.2012, p. 36-41.

    研究成果: Article

    Kodaira, S. ; Naka, S. ; Yasuda, N. ; Kawashima, H. ; Kurano, M. ; Ota, S. ; Ideguchi, Y. ; Hasebe, Nobuyuki ; Ogura, K. / Improvement of charge resolution for high Z/β particles in CR-39 nuclear track detectors by means of two-step etching technique. :: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms. 2012 ; 巻 274. pp. 36-41.
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    abstract = "We verified that the two-step etching method of the combination of pre-etching with PEW (Potassium hydroxide + Ethanol + Water) solution and post-etching with NaOH solution makes drastic improvement of charge resolution for high Z/β particles (Z: nuclear charge, β: velocity) in CR-39 nuclear track detectors. Detectors were exposed to several heavy ions from Ne to Kr with the energies of <500 MeV/n at HIMAC (Heavy Ion Medical Accelerator in Chiba). The optimum etching conditions were determined to be a pre-etching of PEW solution with concentration of 60 wt{\%} of ethanol for 40 min and a post-etching of 7N NaOH for 12 h. This resulted in a charge resolution for Kr (Z/β ∼ 60) of 0.18 c.u. (charge units). The Z/β detection threshold was increased as a function of ethanol concentration in PEW pre-etching solutions. We found that the two-step etching method would be useful technique for the precise charge identification by a single track measurement. The 60 wt{\%} ethanol concentration in PEW would be adequate selection for the purpose of trans-iron nuclei measurement discriminating abundant light nuclei in galactic cosmic rays.",
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    AU - Kodaira, S.

    AU - Naka, S.

    AU - Yasuda, N.

    AU - Kawashima, H.

    AU - Kurano, M.

    AU - Ota, S.

    AU - Ideguchi, Y.

    AU - Hasebe, Nobuyuki

    AU - Ogura, K.

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    AB - We verified that the two-step etching method of the combination of pre-etching with PEW (Potassium hydroxide + Ethanol + Water) solution and post-etching with NaOH solution makes drastic improvement of charge resolution for high Z/β particles (Z: nuclear charge, β: velocity) in CR-39 nuclear track detectors. Detectors were exposed to several heavy ions from Ne to Kr with the energies of <500 MeV/n at HIMAC (Heavy Ion Medical Accelerator in Chiba). The optimum etching conditions were determined to be a pre-etching of PEW solution with concentration of 60 wt% of ethanol for 40 min and a post-etching of 7N NaOH for 12 h. This resulted in a charge resolution for Kr (Z/β ∼ 60) of 0.18 c.u. (charge units). The Z/β detection threshold was increased as a function of ethanol concentration in PEW pre-etching solutions. We found that the two-step etching method would be useful technique for the precise charge identification by a single track measurement. The 60 wt% ethanol concentration in PEW would be adequate selection for the purpose of trans-iron nuclei measurement discriminating abundant light nuclei in galactic cosmic rays.

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    KW - PEW

    KW - Trans-iron nuclei

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