Ionisation density dependence of the optically and thermally stimulated luminescence from Al2O3:C.
This paper presents an overview of recent results on ionisation density dependence of the thermally stimulated luminescence (TL) and optically stimulated luminescence (OSL) signals from Al2O3:C, with emphasis on the sensitivity, efficiency, shape of the TL/OSL curves and the emission spectrum. High-ionisation densities are created uniformly by accumulated high doses of low-linear energy transfer radiation (gamma, beta, X rays) or non-uniformly in heavy charged particle tracks, even at low fluences, as in the case of space radiation fields. Significant deep trap filling, which occurs at these high-ionisation densities, ultimately results in changes in the concentration of recombination centres (F+-centres) and, consequently, in sensitivity changes and other effects. An OSL emission band at 335 nm has been observed in addition to the main F-centre luminescence band, and the relative intensities of these bands have been observed to be dependent on the ionisation density. The implications of these results and open issues are discussed.
Department of Physics, Oklahoma State University, Stillwater, OK 74078, USA. eduyuk@okstate.edu
Eduardo G
EG
Yukihara
Stephen W S
SW
McKeever
D000537:Aluminum Oxide / Q000737:chemistry* / Q000528:radiation effects*; D002244:Carbon / Q000737:chemistry / Q000528:radiation effects; D003198:Computer Simulation; D004307:Dose-Response Relationship, Radiation; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006358:Hot Temperature; D008027:Light; D008422:Materials Testing; D008956:Models, Chemical; D011829:Radiation Dosage; D011839:Radiation, Ionizing; D013819:Thermoluminescent Dosimetry / Q000295:instrumentation* / Q000379:methods*
D002244:Carbon; D000537:Aluminum Oxide