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

    10 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

    Keywords

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

    ASJC Scopus subject areas

    • Radiation
    • Instrumentation

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  • Cite this

    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, 44(9-10), 861-864. https://doi.org/10.1016/j.radmeas.2009.10.057