title: Photocathode non-uniformity contribution to the energy resolution of scintillators.
abstract: This paper introduces the basics of the light transport simulation in scintillators and the wavelength-dependencies in the process. The non-uniformity measurement of the photocathode surface is undertaken, showing that for the photocathode used in this study the quantum efficiency falls to about 4 % of its maximum value, especially in areas far from the centre. The wavelength- and position-dependent quantum efficiency is implemented in the Monte Carlo light transport code, showing that, the contribution of the photocathode non-uniformity to the energy resolution is estimated to be around 18 %, when all position- and wavelength-dependencies are included.
authors.affiliation: Physics Department, School of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran.
authors.forename: M
authors.initials: M
authors.lastname: Mottaghian
authors.forename: R
authors.initials: R
authors.lastname: Koohi-Fayegh
authors.forename: N
authors.initials: N
authors.lastname: Ghal-Eh
authors.forename: G R
authors.initials: GR
authors.lastname: Etaati
mesh_terms: D009010:Monte Carlo Method; D010783:Photometry / Q000295:instrumentation*; D017785:Photons; D011859:Radiography / Q000295:instrumentation*; D011874:Radiometry / Q000295:instrumentation*; D012588:Scintillation Counting