LaBr3: Ce and NaI:Tl performance comparison for single photon emission detector

Marco Bettiol, E. Preziosi, C. Borrazzo, C. Polito, M. N. Cinti, R. Pellegrini, R. Pani

Research output: Contribution to journalArticlepeer-review


In this work, an experimental comparison of the capabilities of a scintillation detector based on a NaI:Tl and a LaBr. 3:Ce monolithic crystals is presented. The main advantage of LaBr. 3:Ce respect to NaI:Tl is its very high light yield (i.e. 63photons/keV versus 38photons/keV), allowing a considerable improvement of the statistical factor affecting light collection and, consequently, Spatial Resolution (SR) and Energy Resolution (ER). Nevertheless, the following results show that the improvement of the SR with the LaBr. 3:Ce is smaller than expected. As analyzed, it could be due to the LaBr. 3:Ce refractive index higher than the NaI:Tl one, that leads to a loss of scintillation light. In fact, the measurements produce similar imaging results (SR at crystal center is about 1.1mm for both crystals), while the ER is slightly better for the LaBr. 3:Ce, as expected (7.6% and 8.8% for LaBr. 3:Ce and NaI:Tl, respectively). This work encourages a further and more specific analysis about how the refractive index affects the amount and the shape of crystal light distribution.

Original languageEnglish
Pages (from-to)154-157
Number of pages4
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Publication statusAccepted/In press - Dec 2 2018
Externally publishedYes


  • LaBr3:Ce
  • Monolithic crystal
  • NaI:Tl
  • Refractive index
  • Scintillation detector

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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