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Thermoluminescence in sintered CaF2:Tb.

Yasunori Fukuda1

  • 1Department of Urban Environment, Osaka Sangyo University, Nakagaito 3-1-1, Daito, Osaka, 574-8530, Japan. fukuda@due.osaka-sandai.ac.jp

Journal of Radiation Research
|June 10, 2003
PubMed
Summary

Thermoluminescence (TL) in calcium fluoride crystals doped with terbium and samarium shows promise for UV radiation dosimetry. The addition of samarium significantly enhanced the TL signal, suggesting potential for accurate dose estimation.

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Area of Science:

  • Solid State Physics
  • Materials Science
  • Radiation Detection

Background:

  • Calcium fluoride (CaF2) is a well-known host material for thermoluminescence (TL) applications.
  • Doping CaF2 with lanthanide elements can modify its TL properties for radiation sensing.
  • Accurate measurement of ultraviolet (UV) radiation dose is crucial in various scientific and industrial fields.

Purpose of the Study:

  • To investigate the thermoluminescence (TL) properties of sintered CaF2 doped with specific lanthanide elements (Tb4O7 and Sm2O3).
  • To evaluate the potential of these materials for observing and estimating ultraviolet (UV) radiation doses.
  • To identify the optimal dopant combination for enhanced TL response to UV radiation.

Main Methods:

  • Sintering of pure CaF2 powder crystals doped with various lanthanide elements, including terbium (Tb) and samarium (Sm).
  • Exposure of the doped CaF2 samples to ultraviolet (UV) radiation.
  • Measurement and analysis of the resulting thermoluminescence (TL) emission spectra and peak intensities at specific temperatures (353 K, 378 K, 458 K).

Main Results:

  • CaF2 doped with terbium (CaF2:Tb) exhibited the highest TL intensity among samples doped with other lanthanides.
  • The TL emission mechanism is proposed to involve the recombination reaction: Tb2+ + hole --> Tb3+* --> Tb3+ + hv.
  • Addition of samarium oxide (Sm2O3) to CaF2:Tb significantly enhanced the intensity of the TL peak observed at 378 K.

Conclusions:

  • CaF2:Tb exhibits strong thermoluminescence (TL) properties suitable for UV radiation detection.
  • The synergistic effect of co-doping with Sm2O3 further enhances the TL signal at 378 K.
  • The enhanced 378 K TL peak in CaF2:Tb, Sm2O3 holds significant potential for development into a sensitive UV dosimeter.

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