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Three-dimensional optical random access memory materials for use as radiation dosimeters.

B M Cullum1, J Mobley, J S Bogard

  • 1Oak Ridge National Laboratory, Tennessee 37831-6101, USA.

Analytical Chemistry
|January 11, 2000
PubMed
Summary
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Researchers developed a novel three-dimensional optical random access memory (3D-ORAM) material and readout system for neutron monitoring. This new dosimeter shows a significant fluorescence decrease upon neutron exposure, enabling radiation dose estimation.

Area of Science:

  • Materials Science
  • Radiation Detection
  • Optical Physics

Background:

  • Accurate monitoring of energetic neutrons is crucial for radiation safety and research.
  • Existing neutron detection methods often have limitations in sensitivity, spatial resolution, or real-time monitoring capabilities.
  • Photochromic materials offer potential for novel dosimetric applications due to their light-induced property changes.

Purpose of the Study:

  • To develop the first three-dimensional optical random access memory (3D-ORAM) material for energetic neutron monitoring.
  • To investigate the suitability of specific photochromic dyes (spirobenzopyran and anthracene) for 3D-ORAM neutron dosimetry.
  • To establish a readout system capable of characterizing radiation for dose estimation.

Main Methods:

Related Experiment Videos

  • Immobilization of spirobenzopyran and anthracene photochromic dyes within a poly(methyl methacrylate) matrix.
  • Irradiation of the developed 3D-ORAM dosimeter materials using a Californium-252 (Cf-252) neutron source.
  • Utilizing fluorescence measurements to assess changes in the dosimeter material after neutron exposure.
  • Development of a two-photon excitation readout system for radiation characterization.

    • Main Results:

    • The 3D-ORAM dosimeter material exhibited a substantial decrease in fluorescence intensity when exposed to neutrons from the Cf-252 source compared to non-irradiated samples.
    • The investigated photochromic dyes (spirobenzopyran and anthracene) demonstrated responsiveness to neutron irradiation within the 3D-ORAM matrix.
    • A functional two-photon excitation readout system was successfully developed for analyzing radiation characteristics.

    Conclusions:

    • The developed 3D-ORAM material shows promise as a sensitive dosimeter for energetic neutrons.
    • The observed fluorescence quenching effect provides a basis for neutron detection and dose assessment.
    • The integrated 3D-ORAM system offers a novel approach for spatial and quantitative monitoring of neutron radiation.