Scintillation properties of RbGd{sub 2}Br{sub 7}:Ce advantages and limitations

Journal Article · Fri Oct 01 04:00:00 EDT 1999 · IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers)

DOI:https://doi.org/10.1109/23.795803· OSTI ID:20000601

Guillot-Noeel, O; Spijker, J.C. van't; Haas, J T.M. de; Dorenbos, P; Eijk, C W.E. van; Kraemer, K W; Guedel, H U

The scintillation properties of RbGd{sub 2}Br{sub 7} crystals, doped with Ce{sup 3+} concentrations of 0.02, 0.11, 0.88, 2.05, 4.1, and 9.8%, are studied under X-ray and {gamma}-quanta excitations. For the RbGd{sub 2}Br{sub 7} sample doped with 9.8% Ce, the authors measured a light yield of 56,000 {+-} 6,000 photons per MeV of absorbed {gamma}-ray energy with a main decay time of 43 {+-} 1 ns, using a Hamamatsu R1791 photomultiplier (PMT), a {sup 137}Cs radioactive source, and a shaping time of 10 {micro}s. A time resolution of 790 {+-} 10 ps was measured for the RbGd{sub 2}Br{sub 7}:9.8% Ce compound, using Baf{sub 2} as second scintillator, two XP2020Q PMT's, a {sup 22}Na source, and an energy threshold set at E {ge} 511 keV. With the R1791 PMT, an energy resolution of 4.1% (FWHM over peak position) for the 662-keV full absorption peak has been observed for two crystals of 7 x 4 x 2 mm{sup 3} with 4.1 and 9.8% Ce content, respectively. Moreover, the nonproportional responses of three RbGd{sub 2}Br{sub 7}:Ce compounds with different concentrations (0.11, 2.05, and 9.8%) were studied revealing an almost-constant light output response from 17.4 keV to 1 MeV. These properties are compared to three other well-known scintillators: NaI:Tl, XsI:Tl, and Lu{sub 2}SiO{sub 5}:Ce.

• Research Organization: Delft Univ. of Technology (NL)
• OSTI ID: 20000601
• Journal Information: IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers), Journal Name: IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers) Journal Issue: 5 Vol. 46; ISSN 0018-9499; ISSN IETNAE
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
44 INSTRUMENTATION
CERIUM IONS
DOPED MATERIALS
ENERGY RESOLUTION
GADOLINIUM BROMIDES
GAMMA DETECTION
INORGANIC PHOSPHORS
RUBIDIUM BROMIDES
SCINTILLATIONS
SOLID SCINTILLATION DETECTORS
TIME RESOLUTION