Advanced high-performance large diameter Cs₂HfCl₆ (CHC) and mixed halides scintillator

Journal Article · Tue Dec 31 00:00:00 EST 2019 · Journal of Crystal Growth

DOI:https://doi.org/10.1016/j.jcrysgro.2019.125473· OSTI ID:1802759

Hawrami, R. ^[1]; Ariesanti, E. ^[2]; Buliga, V. ^[2]; Matei, L. ^[2]; Motakef, S. ^[3]; Burger, A. ^[2]

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1. Fisk Univ., Nashville, TN (United States); Fisk Univ., Nashville, TN (United States)
2. Fisk Univ., Nashville, TN (United States)
3. CapeSym, Inc., Natick, MA (United States)

This paper reports on successful growth and performance evaluation of two large diameter Cs₂HfCl₆ (CHC) and Cs₂HfCl₄Br₂ (CHCB), both recently developed scintillator crystals. The discovery of Cs₂HfCl₆ (CHC) as a scintillator has lately generated much interest in this material and its family, which belongs to the K₂PtCl₆ cubic crystal structure. CHC is an intrinsic scintillator that is non-hygroscopic (slightly deliquescent, i.e., slightly moisture sensitive but does not deteriorate much when left in air), has no self-radioactivity, provides excellent energy resolution, and has excellent non-proportionality. CHC has a moderate density of 3.9 g/cm³ and an effective atomic number of 58. Reported in this paper are transparent crack-free single crystal CHC and CHCB boules of one inch in diameter, both grown using the vertical Bridgman method. Samples retrieved from the boules, sized 23 mm × 30 mm and 23 mm × 26 mm, respectively, are characterized for their optical and scintillation properties. Energy resolutions of 3.5% and 3.7% (FWHM) at 662 keV, respectively, are reported. Light yields of 23,000 ph/MeV and 20,000 ph/MeV have been calculated for the large diameter CHC and CHCB crystals, respectively. Results comparable to previously reported results for smaller crystals have been obtained. Studies on decay time, non-proportionality, as well as detector characterization are also reported.

• Research Organization: CapeSym, Inc., Natick, MA (United States)
• Sponsoring Organization: USDOE; USDOE Office of Science (SC), Engineering & Technology. Office of Small Business Innovation Research (SBIR) and Small Business Technology Transfer (STTR) Programs
• Grant/Contract Number: SC0015733
• OSTI ID: 1802759
• Alternate ID(s): OSTI ID: 1591947
• Journal Information: Journal of Crystal Growth, Journal Name: Journal of Crystal Growth Vol. 533; ISSN 0022-0248
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY