Funct. Mater. 2025; 32 (4): 657-662.
Functional properties of CsI(Tl) scintillation crystals obtained from deeply purified technological residues.
1Institute for Scintillation Materials of National Academy of Sciences of Ukraine, Nauky ave. 60, Kharkiv, 61072, Ukraine
2State Scientific Institution ‘Institute for Single Crystals′ of National Academy of Sciences of Ukraine, Nauky ave. 60, Kharkiv, 61072, Ukraine
3V.N. Karazin Kharkiv National University, Svobody Sq. 4, Kharkiv, 61022, Ukraine
The multifold low-temperature mixed crystallization method (LTMC) was used for deep purification of the technological cesium iodide solutions (residues of the large-scale crystal growth). This treatment provided the raw of high-quality suitable for obtaining the low-background CsI crystals due to low content of K and Rb. Even after 30 LTMC cycles the yield of CsI raw is higher compared to a traditional routine of 3 mass crystallizations. The shape of excitation and emission photoluminescence spectra for CsI(Tl) crystals grown from the obtained raw agrees with those from existing literature. The shapes of photoluminescence and X-ray spectra are also close. The functional parameters (light yield, energy resolution) of crystals grown from the raw obtained after 16 LTMC cycles are not worse than those of the commercially available CsI(Tl) crystals.
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