Control of the detection threshold of CR-39 PNTD for measuring ultra heavy nuclei in galactic cosmic rays

S. Kodaira, N. Yasuda, H. Kawashima, M. Kurano, Nobuyuki Hasebe, T. Doke, S. Ota, K. Ogura

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    It is necessary to develop a track detector with higher detection threshold and high charge resolution for ultra heavy cosmic ray observation. The track registration sensitivity in CR-39 track detector etched by PEW (Potassium-Ethanol-Water) solution was verified using heavy ion beams at the HIMAC accelerator. It was found that PEW solution makes effectively to desensitize the track registration sensitivity in CR-39 detector. Its detection threshold of Z*/β is successfully raised to be Z*/β = 39 by using PEW solution with the concentration of ethanol of 45 wt%. However this produces a "fuzzy track". A two-step process of etching involving a post-etch with 7 mol/l sodium hydroxide solution produced very clear track edges and remarkably improves the charge resolution for heavy ions.

    Original languageEnglish
    Pages (from-to)861-864
    Number of pages4
    JournalRadiation Measurements
    Volume44
    Issue number9-10
    DOIs
    Publication statusPublished - 2009 Oct

    Fingerprint

    Cosmic rays
    heavy nuclei
    Ethanol
    Potassium
    thresholds
    ethyl alcohol
    Detectors
    Heavy ions
    potassium
    Water
    detectors
    heavy ions
    Ion beams
    water
    Particle accelerators
    Etching
    sodium hydroxides
    sensitivity
    Sodium
    cosmic rays

    Keywords

    • CR-39 track detector
    • Detection threshold
    • Galactic cosmic rays
    • PEW etching solution
    • Response curve
    • Ultra heavy nuclei

    ASJC Scopus subject areas

    • Radiation
    • Instrumentation

    Cite this

    Kodaira, S., Yasuda, N., Kawashima, H., Kurano, M., Hasebe, N., Doke, T., ... Ogura, K. (2009). Control of the detection threshold of CR-39 PNTD for measuring ultra heavy nuclei in galactic cosmic rays. Radiation Measurements, 44(9-10), 861-864. https://doi.org/10.1016/j.radmeas.2009.10.057

    Control of the detection threshold of CR-39 PNTD for measuring ultra heavy nuclei in galactic cosmic rays. / Kodaira, S.; Yasuda, N.; Kawashima, H.; Kurano, M.; Hasebe, Nobuyuki; Doke, T.; Ota, S.; Ogura, K.

    In: Radiation Measurements, Vol. 44, No. 9-10, 10.2009, p. 861-864.

    Research output: Contribution to journalArticle

    Kodaira, S, Yasuda, N, Kawashima, H, Kurano, M, Hasebe, N, Doke, T, Ota, S & Ogura, K 2009, 'Control of the detection threshold of CR-39 PNTD for measuring ultra heavy nuclei in galactic cosmic rays', Radiation Measurements, vol. 44, no. 9-10, pp. 861-864. https://doi.org/10.1016/j.radmeas.2009.10.057
    Kodaira, S. ; Yasuda, N. ; Kawashima, H. ; Kurano, M. ; Hasebe, Nobuyuki ; Doke, T. ; Ota, S. ; Ogura, K. / Control of the detection threshold of CR-39 PNTD for measuring ultra heavy nuclei in galactic cosmic rays. In: Radiation Measurements. 2009 ; Vol. 44, No. 9-10. pp. 861-864.
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