TL, EPR and Optical Absorption Studies on Natural Alexandrite Compared to Natural Chrysoberyl

The TL, optical absorption (OA) and EPR properties of natural Brazilian alexandrite and chrysoberyl have been investigated. The TL measurements for natural alexandrite show five peaks between 100 and 450 oC, with their emission spectrum having 370 and/or 570 nm components. The intensity of the 320 o...

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Veröffentlicht in:	Radiation protection dosimetry 2002-01, Vol.100 (1-4), p.471-474
Hauptverfasser:	M. Ferraz, G., Watanabe, S., O. Souza, S., M. F. Scalvi, R.
Format:	Artikel
Sprache:	eng
Schlagworte:	Beryllium - chemistry Beryllium - radiation effects Biological and medical sciences Crystallization Electron Spin Resonance Spectroscopy Hot Temperature Luminescent Measurements Medical sciences Optics and Photonics Thermoluminescent Dosimetry - methods X-Rays
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Beschreibung
Zusammenfassung:	The TL, optical absorption (OA) and EPR properties of natural Brazilian alexandrite and chrysoberyl have been investigated. The TL measurements for natural alexandrite show five peaks between 100 and 450 oC, with their emission spectrum having 370 and/or 570 nm components. The intensity of the 320 oC TL peak was found to be enhanced with pre-annealing treatment, more prominently above 600 oC. The OA and EPR measurements showed that this kind of heat treatment induces the Fe2+® Fe3+ conversion in the natural sample. Chrysoberyl samples exhibited the TL peaks at the same temperatures as alexandrite samples, but the glow curves were more than 200 times less intense than alexandrite ones.
ISSN:	0144-8420 1742-3406
DOI:	10.1093/oxfordjournals.rpd.a005917