Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 537, Issue 1-2, Pages 411-414Publisher
ELSEVIER
DOI: 10.1016/j.nima.2004.08.054
Keywords
glasses; luminescence; irradiation; EPR spectroscopy
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The luminescence of pristine and gamma-irradiated Sm3+ doped borosilicate glasses was studied as a function of Sm content. For these glass compositions, observed critical concentration for the appearance of luminescence quenching is less than 1 wt% of Sm2O3. The fluorescence spectra reveal that the reduction processes of Sm-3divided by to Sm-2divided by ions is accomplished in case of exposure glass composition to ionizing radiation like gamma rays, while the Sm-2divided by ions are not present into the pristine samples. The luminescence intensity of Sm-2divided by ions is discussed in relation to the irradiation dose and magnification under micro Raman spectrometer. It is assumed that the divalent rare-earth ions are preferentially located in the bulk than near the surface of glass. Results on reduction of Sm-3divided by are also discussed in correlation with defects creation processes analysed by EPR spectroscopy. (C) 2004 Elsevier B.V. All rights reserved.
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