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Related Experiment Videos

Neutron detection based upon a lithiated sol-gel glass

Wallace1, Hiller, Dai

  • 1Nuclear Engineering Department, University of Tennessee, Knoxville 37996-2300, USA. bjwallac@esper.com

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|September 26, 2000
PubMed
Summary

Sol-gel technology was used to dope glass films with boron-10, lithium-6, and uranium-235 for silicon surface barrier detectors. Lithium-6 doped films showed significantly higher neutron detection rates compared to boron-10.

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Area of Science:

  • Materials Science
  • Nuclear Engineering
  • Analytical Chemistry

Background:

  • Sol-gel technology enables wet chemistry formation of glass films.
  • Doped glass films are utilized for sensing applications, including pH, temperature, and chemical presence.
  • Silicon surface barrier (SSB) detectors are sensitive radiation detection devices.

Purpose of the Study:

  • To investigate the doping of glass films with specific isotopes (Boron-10, Lithium-6, Uranium-235) using sol-gel technology.
  • To evaluate the performance of these doped glass films on SSB detectors for neutron detection.
  • To compare the neutron detection response of different dopant materials.

Main Methods:

  • Sol-gel technology was employed for the wet chemistry formation of glass films.

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  • Boron-10, Lithium-6, and Uranium-235 were doped into the glass films.
  • Doped glass films were applied to silicon surface barrier (SSB) detectors.
  • Neutron activation sources were used to test detector response.
  • A commercial preamp/amplifier and IEEE-488 NIM counter were utilized for data acquisition.
  • Thermal neutron mapping was performed using a portable personal computer.

    • Main Results:

    • The lithium-6 doped glass film on the SSB detector yielded approximately four times the count rate compared to the boron-10 doped glass film.
    • The uranium-235 doped glass film exhibited a lower count rate but maintained a stable output signal.
    • The stability of the U-235 doped film was attributed to alpha activity from Uranium-235 and trace Uranium-234.

    Conclusions:

    • Sol-gel technology is effective for creating doped glass films for radiation detection applications.
    • Lithium-6 doped films demonstrate superior neutron detection efficiency compared to boron-10 doped films for SSB detectors.
    • Uranium-235 doping offers a stable signal output, potentially useful for specific monitoring tasks.