Comparative measurements on LaBr3(Ce) and LaCl3(Ce) scintillators coupled to PSPMT

Wonho Lee, David K. Wehe, Byoungjik Kim

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)


We present the results of energy resolution measurements at 662 keV for a LaBr3 crystal (3.67%) and a 6×6 array of LaCl3 crystals (4.65%) coupled to a 5" diameter Hamamatsu PSPMT, and compare them to measurements on arrays of NaI (7.37%) and BGO (16.07%). The raw spectra obtained using the full PSPMT area were less impressive due to the well-known position-dependent sensitivity of the PSPMT. The raw energy resolution of the total area of LaCl3 without collimation is poor (13%) but it is much improved by position dependent gain correction (5.85%).To avoid this complication, the spectra were acquired using a well-collimated source focused upon a small area of the detector. 2D flood-field radiation images from those scintillators were also obtained. The position distortion due to the light spreading in the scintillator and the non-uniformity of the PSPMT were corrected by several methods. Gaussian fitting was found to be superior to other methods but at the expense of increased processing time.

Original languageEnglish
Pages (from-to)861-864
Number of pages4
JournalIEEE Nuclear Science Symposium Conference Record
Publication statusPublished - 2004
Externally publishedYes
Event2004 Nuclear Science Symposium, Medical Imaging Conference, Symposium on Nuclear Power Systems and the 14th International Workshop on Room Temperature Semiconductor X- and Gamma- Ray Detectors - Rome, Italy
Duration: 2004 Oct 162004 Oct 22

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Radiology Nuclear Medicine and imaging


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