Crystal Growth, Optical and Scintillation Properties of Eu²⁺-doped TlSr₂Br₅

Journal Article · Mon Jun 30 00:00:00 EDT 2025 · IEEE Transactions on Nuclear Science

DOI:https://doi.org/10.1109/TNS.2025.3584220· OSTI ID:2571602

Van Loef, Edgar ^[1]; Innis, Myles ^[1]; Schott, Jared ^[1]; Pestovich, Kimberly ^[2]; Stand, Luis ^[2]; Zhuravleva, Mariya ^[2]; Melcher, Charles ^[2]; Pandian, Lakshmi Soundara ^[1]; Glodo, Jarek ^[1]

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1. Radiation Monitoring Devices, Inc., Watertown, MA (United States)
2. University of Tennessee, Knoxville, TN (United States)

Crystals of undoped and Eu²⁺-doped TlSr₂Br₅ of up to 16 mm in diameter and 50 mm in length were grown by the Vertical Bridgman technique. TlSr₂Br₅ has the monoclinic crystal structure with space group P21/c. Its density and Z_eff are 5.03 g/cm³ and 58.6, respectively. Radioluminescence spectra of undoped and Eu²⁺-doped TlSr₂Br₅ feature a broad emission band peaking at about 440 nm for undoped and 520 nm for Eu²⁺-doped crystals. The light yield of undoped TlSr₂Br₅ is 42,000 ph/MeV, which increases to 55,000 ph/MeV for Eu²⁺-doped crystals. The energy resolution at 662 keV (¹³⁷Cs) is about 5 – 6% (FWHM). As a result, the scintillation decay of undoped and Eu²⁺-doped TlSr₂Br₅ is of the order of 100s of nanoseconds.

• Research Organization: Radiation Monitoring Devices, Inc., Watertown, MA (United States); University of Tennessee, Knoxville, TN (United States)
• Sponsoring Organization: U.S. Department of Homeland Security; USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: NA0003996
• OSTI ID: 2571602
• Journal Information: IEEE Transactions on Nuclear Science, Journal Name: IEEE Transactions on Nuclear Science; ISSN 0018-9499; ISSN 1558-1578
• Publisher: IEEE
• Country of Publication: United States
• Language: English

Related Subjects

Bridgman Technique
Eu2+
Inorganic scintillators
Radiography
Thallium compounds
TlSr2Br5