CdTe and CdZnTe detectors for timing measurements

Yuu Okada, Tadayuki Takahashi, Goro Sato, Shin Watanabe, Kazuhiro Nakazawa, Kunishiro Mori, Kazuo Makishima

    Research output: Contribution to journalArticle

    25 Citations (Scopus)

    Abstract

    We measured timing properties of CdTe and CdZnTe semiconductor detectors with planar configuration. We developed a new method to evaluate their performance in timing resolution utilizing an 241Am-doped plastic scintillator. We confirmed that the low mobility and short lifetime of holes are major obstacles to their timing resolution. However, their timing properties can be very much improved, either by applying a high electric field that increases the carrier speed or by selecting those events which are dominated by the electron signal. We demonstrated the latter through a pulse-shape discrimination technique using two different integration time constants. In conjunction with a newly developed CdTe diode, we obtained a superior timing resolution of 5.8 ns. We also discussed the application of CdTe to positron emission tomography (PET), employing the standard 511 keV gamma-gamma coincidence method. We confirmed that a geometrical configuration in which the electrodes are parallel to the incident γ-rays gives about three times better timing response than a geometry when the electrodes are perpendicular to the γ-ray beam.

    Original languageEnglish
    Pages (from-to)1986-1992
    Number of pages7
    JournalIEEE Transactions on Nuclear Science
    Volume49 I
    Issue number4
    DOIs
    Publication statusPublished - 2002 Aug

    Fingerprint

    time measurement
    Detectors
    Semiconductor detectors
    Electrodes
    Positron emission tomography
    detectors
    Phosphors
    Diodes
    Electric fields
    Plastics
    Geometry
    Electrons
    rays
    electrodes
    configurations
    scintillation counters
    time constant
    discrimination
    positrons
    plastics

    Keywords

    • CdTe
    • CdZnTe
    • Timing

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Nuclear Energy and Engineering

    Cite this

    Okada, Y., Takahashi, T., Sato, G., Watanabe, S., Nakazawa, K., Mori, K., & Makishima, K. (2002). CdTe and CdZnTe detectors for timing measurements. IEEE Transactions on Nuclear Science, 49 I(4), 1986-1992. https://doi.org/10.1109/TNS.2002.801709

    CdTe and CdZnTe detectors for timing measurements. / Okada, Yuu; Takahashi, Tadayuki; Sato, Goro; Watanabe, Shin; Nakazawa, Kazuhiro; Mori, Kunishiro; Makishima, Kazuo.

    In: IEEE Transactions on Nuclear Science, Vol. 49 I, No. 4, 08.2002, p. 1986-1992.

    Research output: Contribution to journalArticle

    Okada, Y, Takahashi, T, Sato, G, Watanabe, S, Nakazawa, K, Mori, K & Makishima, K 2002, 'CdTe and CdZnTe detectors for timing measurements', IEEE Transactions on Nuclear Science, vol. 49 I, no. 4, pp. 1986-1992. https://doi.org/10.1109/TNS.2002.801709
    Okada Y, Takahashi T, Sato G, Watanabe S, Nakazawa K, Mori K et al. CdTe and CdZnTe detectors for timing measurements. IEEE Transactions on Nuclear Science. 2002 Aug;49 I(4):1986-1992. https://doi.org/10.1109/TNS.2002.801709
    Okada, Yuu ; Takahashi, Tadayuki ; Sato, Goro ; Watanabe, Shin ; Nakazawa, Kazuhiro ; Mori, Kunishiro ; Makishima, Kazuo. / CdTe and CdZnTe detectors for timing measurements. In: IEEE Transactions on Nuclear Science. 2002 ; Vol. 49 I, No. 4. pp. 1986-1992.
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