Journal of Synchrotron Radiation

Volume 15, Part 4 (July 2008)

research papers

J. Synchrotron Rad. (2008). 15, 363-370 [ doi:10.1107/S0909049508011370 ]

A high-spatial-resolution three-dimensional detector array for 30-200 keV X-rays based on structured scintillators

U. L. Olsen, S. Schmidt and H. F. Poulsen

Abstract: A three-dimensional X-ray detector for imaging 30-200 keV photons is described. It comprises a set of semi-transparent structured scintillators, where each scintillator is a regular array of waveguides in silicon, and with pores filled with CsI. The performance of the detector is described theoretically and explored in detail through simulations. Based on available hardware, a spatial resolution of 1 µm is obtainable. The resolution of a single screen is shown to be determined only by the pitch, at least up to 100 keV. In comparison with conventional homogeneous screens, an improvement in efficiency by a factor of 5-15 is obtainable. The cross-talk between screens in the three-dimensional detector is shown to be negligible. The three-dimensional concept enables ray-tracing and super-resolution algorithms to be applied.

Keywords: scintillator; detector; imaging; hard X-rays; simulation.