title: A novel epitaxially grown LSO-based thin-film scintillator for micro-imaging using hard synchrotron radiation.
abstract: The efficiency of high-resolution pixel detectors for hard X-rays is nowadays one of the major criteria which drives the feasibility of imaging experiments and in general the performance of an experimental station for synchrotron-based microtomography and radiography. Here the luminescent screen used for the indirect detection is focused on in order to increase the detective quantum efficiency: a novel scintillator based on doped Lu(2)SiO(5) (LSO), epitaxially grown as thin film via the liquid phase epitaxy technique. It is shown that, by using adapted growth and doping parameters as well as a dedicated substrate, the scintillation behaviour of a LSO-based thin crystal together with the high stopping power of the material allows for high-performance indirect X-ray detection. In detail, the conversion efficiency, the radioluminescence spectra, the optical absorption spectra under UV/visible-light and the afterglow are investigated. A set-up to study the effect of the thin-film scintillator's temperature on its conversion efficiency is described as well. It delivers knowledge which is important when working with higher photon flux densities and the corresponding high heat load on the material. Additionally, X-ray imaging systems based on different diffraction-limited visible-light optics and CCD cameras using among others LSO-based thin film are compared. Finally, the performance of the LSO thin film is illustrated by imaging a honey bee leg, demonstrating the value of efficient high-resolution computed tomography for life sciences.
authors: European Synchrotron Radiation Facility, F-38043 Grenoble Cedex, France. paul_antoine.douissard@esrf.fr
authors: Paul Antoine
authors: PA
authors: Douissard
authors: Angelica
authors: A
authors: Cecilia
authors: Thierry
authors: T
authors: Martin
authors: Valentin
authors: V
authors: Chevalier
authors: Maurice
authors: M
authors: Couchaud
authors: Tilo
authors: T
authors: Baumbach
authors: Klaus
authors: K
authors: Dupré
authors: Markus
authors: M
authors: Kühbacher
authors: Alexander
authors: A
authors: Rack
mesh_terms: D000818:Animals; D001516:Bees / Q000648:ultrastructure*; D005121:Extremities / Q000033:anatomy & histology; D008187:Lutetium; D011856:Radiographic Image Enhancement / Q000379:methods*; D017640:Silicates; D017356:Synchrotrons; D014963:X-Ray Intensifying Screens; D055114:X-Ray Microtomography / Q000379:methods
chemical_list: D017640:Silicates; C477682:lutetium orthosilicate; D008187:Lutetium