Suren Kandasamy Dissertation.pdf - University of Surrey

M.Sc DissertationThe most commonly used scintillator is NaI:Tl, which has a peak emission of 415nm, a light output of ~39,000 photons/MeV,. a density of 3.73gcm , and a decay time of240 nanoseconds. The energy resolution is typically 5−6 % FWHM for 662 keV gammarays with NaI:Tl [3].Recently, new cerium doped lanthanum halide scintillators, LaCl 3 :Ce(10%) andLaBr 3 :Ce(5%), have been discovered. LaCl 3 :Ce(10%) has a density of 3.93gcm , a lightoutput of 46,000 photons/MeV, and a decay time of 28 nanoseconds. Its peak emissionwavelength is 350 nm. On the other hand, LaBr 3 :Ce(5%) has a density of 5.33gcm , alight output of 60,000 photons/MeV, and a decay time of 26 nanoseconds. Its peakemission wavelength is 380 nm [13].Nowadays several groups are doing researches on the properties of LaCl 3 :Ce andLaBr 3 :Ce detectors, since Delft and Bern universities have discovered these scintillatordetectors. BrilLanCe TM 350 and BrilLanCe TM 380 crystals are the available crystals inthe commercial industry made by Saint-Gobain Crystal. Specifically, in this work,BrilLanCe B350 is LaCl 3 : Ce(10%) and BrilLanCe 380 is LaBr 3 :Ce(5%). These newscintillators have about 3% FWHM energy resolution for 662 keV gamma rays, andhave a more linear response with energy than NaI:Tl [5].The aim of this study is to evaluate and characterise of LaCl 3 :Ce(10%) with thesize of 44.450.8mmcrystal for gamma-ray spectroscopy application. For thisreport discuss about the characteristic of LaCl 3 :Ce detector, such as energy resolution,detection efficiency and time resolution.K. Suren 2