Thermoluminescence properties of natural zoisite mineral under γ-irradiations and high temperature annealing

Henry Sixto Javier Ccallata, L. Tomaz Filho, S. Watanabe

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Natural silicate mineral of zoisite, Ca2Al3(SiO 4)(Si2O7)O(OH), has been investigated concerning γ-radiation, UV-radiation and high temperature annealing effects on thermoluminescence (TL). X-ray diffraction (XRD) measurement confirmed zoisite structure and X-ray fluorescence (XRF) analysis revealed besides Si, Al and Ca that are the main crystal components, other oxides of Fe, Mg, Cr, Na, K, Sr, Ti, Ba and Mn which are present in more than 0.05 wt%. The TL glow curve of natural sample contains (130-150), (340-370) and (435-475) °C peaks. Their shapes indicated a possibility that they are result of composition of two or more peaks strongly superposed, a fact confirmed by deconvolution method. Once pre-annealed at 600 °C for 1 h, the shape of the glow curves change and the zoisite acquires high sensitivity. Several peaks between 100 and 400 °C appear superposed, and the high temperature peak around 435 °C cannot be seen. The ultraviolet radiation, on the other hand, produces one TL peak around 130 °C and the second one around 200 °C and no more.

Original languageEnglish
Pages (from-to)1272-1277
Number of pages6
JournalSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Volume78
Issue number4
DOIs
StatePublished - Apr 2011
Externally publishedYes

Bibliographical note

Funding Information:
We would like to thank Ms. E. Somesari and Mr. C. Gaia for kindly carrying out irradiation of the samples. This work was supported by CAPES and FAPESP.

Keywords

  • Annealing
  • CGCD
  • Thermoluminescence
  • UV
  • Zoisite mineral

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