Thallium-based scintillators for high-resolution gamma-ray spectroscopy: Ce3+- doped Tl2LaCl5 and Tl2LaBr5

Shirwadkar, Urmila; Loyd, Matthew; Du, Mao-Hua; van Loef, Edgar; Ciampi, Guido; Soundara Pandian, Lakshmi; Stand, Luis; Koschan, Merry; Zhuravleva, Mariya; Melcher, Charles; Shah, Kanai

doi:10.1016/j.nima.2020.163684

Title: Thallium-based scintillators for high-resolution gamma-ray spectroscopy: Ce³⁺- doped Tl₂LaCl₅ and Tl₂LaBr₅

Journal Article · Thu Feb 27 00:00:00 EST 2020 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2020.163684· OSTI ID:1606638

Shirwadkar, Urmila ^[1]; Loyd, Matthew ^[2];

^[3]; van Loef, Edgar ^[1]; Ciampi, Guido ^[1]; Soundara Pandian, Lakshmi ^[1]; Stand, Luis ^[2]; Koschan, Merry ^[2]; Zhuravleva, Mariya ^[2]; Melcher, Charles ^[2]; Shah, Kanai ^[1]

Radiation Monitoring Devices Inc., Watertown, MA (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

In this paper we report on the crystallographic and scintillation properties of Tl₂LaCl₅:Ce $^{3 +}$ and Tl₂LaBr₅:Ce $^{3 +}$ , two novel thallium-containing high-resolution scintillators for gamma-ray spectroscopy. Crystals of Tl₂LaCl₅:Ce $^{3 +}$ and Tl₂LaBr₅:Ce $^{3 +}$ were grown by the Vertical Bridgman method up to 1-inch diameter and 1-inch long. Single crystals of Tl₂LaCl₅:Ce $^{3 +}$ and Tl₂LaBr₅:Ce $^{3 +}$ belong to the orthorhombic system with space group 62 and have a density of 5.16 and 5.98 g/cm³, respectively. The scintillators show high light yields of up to 68,000 photons/MeV, excellent gamma-ray energy resolution of $\leq$ 3% at 662 keV, a fast scintillation decay, and a proportional response over a wide range of energies from 32 keV up to 1275 keV. Density Functional Theory calculations show that the Ce $^{3 +}$ energy levels are inside the bandgap despite the smaller bandgap of Tl₂LaCl₅ and Tl₂LaBr₅ compared to K₂LaCl₅ and K₂LaBr₅. Finally, a systematic Ce $^{3 +}$ concentration study was performed for Tl₂LaCl₅:Ce $^{3 +}$ and trends observed.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; Defense Threat Reduction Agency (DTRA)

Grant/Contract Number:: AC05-00OR22725; HDTRA1-19-1-0014

OSTI ID:: 1606638

Journal Information:: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 962, Issue C; ISSN 0168-9002

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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Title: Thallium-based scintillators for high-resolution gamma-ray spectroscopy: Ce3+- doped Tl2LaCl5 and Tl2LaBr5

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Title: Thallium-based scintillators for high-resolution gamma-ray spectroscopy: Ce³⁺- doped Tl₂LaCl₅ and Tl₂LaBr₅