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

被引：12

作者：

Shirwadkar, Urmila ^{[1
]}

Loyd, Matthew ^{[2
]}

Du, Mao-Hua ^{[3
]}

van Loef, Edgar ^{[1
]}

Ciampi, Guido ^{[1
]}

Pandian, Lakshmi Soundara ^{[1
]}

Stand, Luis ^{[2
]}

Koschan, Merry ^{[2
]}

Zhuravleva, Mariya ^{[2
,4
]}

Melcher, Charles ^{[2
,4
,5
]}

Shah, Kanai ^{[1
]}

机构：

[1] Radiat Monitoring Devices Inc, 44 Hunt St, Watertown, MA 02472 USA

[2] Univ Tennessee, Scintillat Mat Res Ctr, Knoxville, TN 37996 USA

[3] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[4] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

[5] Univ Tennessee, Dept Nucl Engn, Knoxville, TN 37996 USA

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2020年 / 962卷 / 962期

关键词：

Inorganic scintillators; Thallium-based scintillators; Radiation detectors; Gamma-ray spectroscopy; DFT calculations; THERMAL-EXPANSION;

D O I：

10.1016/j.nima.2020.163684

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

In this paper we report on the crystallographic and scintillation properties of Tl2LaCl5:Ce3+ and Tl2LaBr5:Ce3+, two novel thallium-containing high-resolution scintillators for gamma-ray spectroscopy. Crystals of Tl2LaCl5: Ce3+ and Tl2LaBr5:Ce3+ were grown by the Vertical Bridgman method up to 1-inch diameter and 1-inch long. Single crystals of Tl2LaCl5:Ce3+ and Tl2LaBr5:Ce3+ belong to the orthorhombic system with space group 62 and have a density of 5.16 and 5.98 g/cm(3), respectively. The scintillators show high light yields of up to 68,000 photons/MeV, excellent gamma-ray energy resolution of <= 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 Ce3+ energy levels are inside the bandgap despite the smaller bandgap of Tl2LaCl5 and Tl2LaBr5 compared to K2LaCl5 and K2LaBr5. A systematic Ce3+ concentration study was performed for Tl2LaCl5:Ce3+ and trends observed.

引用

页数：7

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