Growth and Scintillation Characteristics of CsI(Br) Single Crystals

Le résumé fourni par la source

CsI(Br) single crystals doped with 1, 3, 5 or 10 mole% ions, as an activator, were grown by Czochralski method. The lattice structure of grown CsI(Br) single crystal was bcc and its lattice constant was . The absorption edge of the CsI(Br) single crystals was observed at 243 nm. The spectral range of the luminescence excited by 243 nm of wavelength was , and its peak emission appeared at 440 nm. The luminescence intensity was maximum when CsI(Br) was doped with 3 mole % ions. The energy resolutions of the CsI(Br) scintillator doped with 3 mole % ions were 15.0% for (662 keV), 13.1% for (835 keV), and 18.0% and 6.3% for (511 keV and 1275 keV), respectively. The decay curves had fast and slow components, and the fast component was about 41 ns independent on the concentration of the ions. The time resolution of CsI(Br) scintillators decreased with increasing of the concentration of ions.

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