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3 Acta Physica Polonica A

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Color Centers in Ca_4GdO(BO_3)_3 Single Crystals Irradiated by Gamma Quanta

100%

Potera P. , Lukasiewicz T. , Piecuch A.

Acta Physica Polonica A

2013

tom 124

nr 1

122-124

The present work is devoted to investigation of optical absorption in pure Ca_4GdO(BO_3)_3 single crystals in the spectral range 0.2-1.1 μm induced under influence of the gamma quanta irradiation with absorbed dose 2 × 10^3 Gy. The effect of heating in air on the absorption spectrum of irradiated sample is also studied.

Stable Color Centers Induced in Pure and Neodymium Doped Ca_{0.28}Ba_{0.72}Nb_{2}O_{6} Crystals by Gamma Irradiation

100%

Potera P. , Zhydachevskii Y. , Lukasiewicz T.

Acta Physica Polonica A

2015

tom 127

nr 3

753-755

The work is devoted to investigation of stable coloration induced by gamma radiation from ^{60}Co (1.25 MeV) in pure and neodymium doped Ca_{0.28}Ba_{0.72}Nb_{2}O_{6} single crystals. Nature of the induced absorption is discussed. This absorption is due to charge change of native defects or ions forming of crystals (vacancy, niobium ions, etc.). The nature of color centers responsible for induced absorption is discussed.

Changes in Luminescence of Ce:yag Crystals Under Ionizing Radiation Treatment

75%

Kaczmarek S. , Moroz Z. , Kwasny M. , Kisielewski J. , Lukasiewicz T. , Wojtkowska J. , Rzewuski H.

Acta Physica Polonica A

1999

tom 95

nr 6

953-964

Radiation induced changes in the luminescence spectrum under influence of UV light, γ-rays, electrons and protons for several concentrations of Ce^{3+} ions as well as Mg^{2+} ions in yttrium-aluminum garnet crystals were investigated. To irradiate with γ and electron as grown crystals were used while for proton irradiations the crystals were thermally annealed. For small concentrations of cerium ions (≈0.01 at.%) an increase in the luminescence (about 100%) was observed after gamma irradiation with a dose of 10^{5} Gy. This increase was due to the growth in Ce^{3+} ions concentration after γ-irradiation (≈50%), due to the Ce^{4+} → Ce^{3+} recharging reaction. For highly doped Ce:YAG crystals (0.1 at%, 0.2 at.%) also an increase, but much smaller (4%), for the Mg codoped crystals (0.1 at.%) was observed. After 1 MeV electron irradiation in the over-threshold type interaction a decrease in luminescence is observed due to the domination of the Ce^{3+} → Ce^{4+} ionization process. In the case of the proton irradiation, for small fluencies (≈10^{13} particles/cm^{2}) an increase in luminescence is observed due to the domination of the recharging processes of Ce^{4+} ions. For larger fluencies (>10^{14} particles/cm^{2}) a decrease takes place due to a high level of radiation defects.