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High-rate Gamma Spectrometry Using a LaBr3(Ce) Scintillator with a Fast Pulse Shaping.

Tianyi Ren, Soo Hyun Byun

    Health Physics
    |March 25, 2024
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    Summary

    This study optimized a lanthanum bromide (LaBr3(Ce)) gamma spectrometer for high count rates. Eliminating the preamplifier significantly improved system dead time, enhancing performance up to 150 kcps.

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    Area of Science:

    • Nuclear spectroscopy
    • Gamma-ray detection

    Background:

    • Lanthanum bromide (LaBr3(Ce)) scintillators are crucial for gamma-ray spectroscopy.
    • High count rates pose challenges to spectrometer performance due to increased dead time.

    Purpose of the Study:

    • To evaluate the performance of a LaBr3(Ce) gamma spectrometer at high input count rates (up to 1.3 Mcps).
    • To improve the spectrometer's speed and energy resolution by modifying the signal processing chain.

    Main Methods:

    • A LaBr3(Ce) gamma spectrometer's preamplifier was removed, directly feeding the photomultiplier tube signal to a digital pulse processing system.
    • Pulse-shaping parameters were optimized at 1.5 kcps, followed by measurements at various count rates (1.5 kcps to 1.3 Mcps) using 137Cs sources.

    Main Results:

    • The spectrometer demonstrated excellent performance up to an input count rate of 150 kcps.
    • System dead time increased rapidly above 150 kcps, but was significantly reduced by removing the preamplifier.

    Conclusions:

    • Eliminating the preamplifier greatly improved the system dead time of the LaBr3(Ce) gamma spectrometer.
    • The modified system offers enhanced performance for high count rate applications in gamma-ray spectroscopy.