Excitonic processes and their contribution to nonproportionality observed in the light yield of inorganic scintillators*
School of Engineering and IT, B-purple-12, Faculty of EHSE, Charles Darwin University, Darwin NT 0909, Australia
Received: 26 July 2012
Received in final form: 23 October 2012
Published online: 4 February 2013
Using the derived expression for the light yield in a scintillator, the influence of linear radiative and non-radiative (quenching) rates on the nonproportionality in light yield is studied. It is found that if the excitation created within the electron track initiated by a γ-photon incident on a scintillator remains mainly excitonic, then nonproportionality can be minimised by inventing a scintillator material with linear radiative rate >107 s-1, linear quenching rate <106 s-1 and track radius ≥70 nm along with maintaining the rates of other nonlinear processes as discovered earlier. If one can increase the linear radiative rate to 109 s-1, then the nonproportionality can be eliminated at a track radius >20 nm.
Key words: Topical issue: Excitonic Processes in Condensed Matter, Nanostructured and Molecular Materials. Guest editors: Maria Antonietta Loi, Jasper Knoester and Paul H. M. van Loosdrecht
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2013