Abstract
The methods of vacuum ultraviolet and thermal activation spectroscopy were used to measure the excitation spectra of impurity radiation in the fundamental absorption band of K 2 SO 4 -Cu crystals at 15 K and 300 K. An energy transfer was detected from the base to Cu + impurities. The band gap of crystals K 2 SO 4 was estimated. In K 2 SO 4 -Cu crystals, recombination radiation bands were detected at 2.95 ÷ 3.0 eV corresponding to electron hole capture centers.
Highlights
Sulfates of alkali and alkaline earth metals activated by various impurities are widely used in thermoluminescent dosimeters (TLD) and scintillators
Defects in activated sulfates are created by several mechanisms: during irradiation the created electron-hole pairs are localized on matrix ions or activators; creation of Frenkel pairs of defects in the electronic excitations decay; anionic or cationic
In alkali metal sulfates activated by impurities Cu + sulfates, an emission band was detected in the spectral region 2.7 ÷ 2.9 eV
Summary
Sulfates of alkali and alkaline earth metals activated by various impurities are widely used in thermoluminescent dosimeters (TLD) and scintillators. They are mainly used as TLD dosimeters. The sensitivity of TLD dosimeters depends on the concentration of defects generated during irradiation. Introduced activators increase the concentration of defects in sulfates of alkali and alkaline earth metals in several times. Defects in activated sulfates are created by several mechanisms: during irradiation the created electron-hole pairs are localized on matrix ions or activators; creation of Frenkel pairs of defects in the electronic excitations decay; anionic or cationic
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