Scintillation properties of RbGd{sub 2}Br{sub 7}:Ce advantages and limitations
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), Vol. 46, Issue 5; Other Information: PBD: Oct 1999; ISSN 0018-9499
- Country of Publication:
- United States
- Language:
- English
Similar Records
Upconversion luminescence in Er{sup 3+}-doped RbGd{sub 2}Cl{sub 7} and RbGd{sub 2}Br{sub 7}
Scintillation properties of Ce sup 3+ doped BaF sub 2 crystals