1. Effects of zirconium codoping on the optical and scintillation properties of SrI2:Eu[formula omitted] single crystals.
- Author
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Wu, Yuntao, Li, Qi, Rutstrom, Daniel J., Greeley, Ian, Stand, Luis, Loyd, Matthew, Koschan, Merry, and Melcher, Charles L.
- Subjects
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SINGLE crystals , *OPTICAL properties , *ZIRCONIUM , *SCINTILLATORS , *EUROPIUM , *RARE earth metals - Abstract
Europium doped strontium iodide (SrI 2 :Eu 2 +) is one of the cutting-edge halide scintillators for gamma-ray spectroscopy applications due to its low radioactive background, ultrahigh light yield (70,000–100,000 photons/MeV), and excellent gamma-ray energy resolution (2.6%–3% at 662 keV). In this work, we report an improvement in the scintillation characteristics of SrI 2 :Eu 2 + single crystals via tetravalent ion codoping, namely Zr 4 +. High quality SrI 2 :Eu 2 + single crystals codoped with 0, 0.05, 0.1, and 0.2 at.% Zr 4 + were grown by the Multi-ampoule Bridgman method. All of the as-grown crystals are transparent, crack-and inclusion-free. They have high optical quality with a transmittance of over 70%. The effects of Zr 4 + codoping on spectral properties and decay kinetics of SrI 2 :Eu 2 + under optical, and x- and gamma-ray excitation are studied. An enhancement of gamma-ray spectroscopic resolution from 2.8 to 2.5% at 662 keV and 5.4 to 5% at 122 keV is achieved upon Zr 4 + codoping with a slightly enhanced light yield of 95,000 photons/MeV. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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