Response of cathodoluminescence of alkali feldspar to He+ ion implantation and electron irradiation

Masahiro Kayama, Hirotsugu Nishido, Shin Toyoda, Kosei Komuro, Adrian A. Finch, Martin R. Lee, Kiyotaka Ninagawa

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Cathodoluminescence (CL) of minerals such as quartz and zircon has been extensively studied to be used as an indicator for geodosimetry and geochronometry. There are, however, very few investigations on CL of other rock-forming minerals such as feldspars, regardless of their great scientific interest. This study has sought to clarify the effect of He+ ion implantation and electron irra-diation on luminescent emissions by acquiring CL spectra from various types of feldspars including anorthoclase, amazonite and adularia. CL intensities of UV and blue emissions, assigned to Pb2+ and Ti 4+ impurity centers respectively, decrease with an increase in radiation dose of He+ ion implantation and electron irradiation time. This may be due to decrease in the luminescence efficiencies by a change of the activation energy or a conversion of the emission center to a non-luminescent center due to an alteration of the energy state. Also, CL spectroscopy of the alkali feldspar revealed an in-crease in the blue and yellow emission intensity assigned to Al-O-Al/Ti defect and radiation-induced defect centers with the radiation dose and the electron irradiation time. Taken together these results indicate that CL signal should be used for estimation of the α and β radiation doses from natural radi-onuclides that alkali feldspars have experienced.

Original languageEnglish
Pages (from-to)244-249
Number of pages6
JournalGeochronometria
Volume40
Issue number4
DOIs
Publication statusPublished - 2013 Dec

Keywords

  • Alkali feldspar
  • Cathodoluminescence
  • Electron irradiation
  • He ion implantation

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

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