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X-Ray Quantum Efficiency Of Microchannel Plates

Authors :
Paul J. Bjorkholm
Leon P. Van Speybroeck
Michael Hecht
Source :
X-Ray Imaging.
Publication Year :
1977
Publisher :
SPIE, 1977.

Abstract

The quantum efficiency of microchannel plates has been measured at energies from 0.28 to 3.0 keV and at angles less than 6°. The quantum efficiency reaches a maximum of 27% at 3° and an energy of 0.86 keV. At all energies, the quantum efficiency increases as the angle of incidence decreases until a critical angle is reached, after which the efficiency decreases rapidly. The quantum efficiency, outside of the small angle dip, decreases with energy at a constant angle. The general behaviour of the quantum efficiency can be understood using a very simple physical model. The low angle dip is caused by reflection from the surface of the channel. The variation of the quantum efficiency as a function of energy can be explained by the variation of the X-ray absorption and of the photo- and Auger electron ranges. The data are reasonably reproduced by a simple model.

Details

ISSN :
0277786X
Database :
OpenAIRE
Journal :
X-Ray Imaging
Accession number :
edsair.doi...........1ce2ec291215af86e17ac0927a910eb9
Full Text :
https://doi.org/10.1117/12.955471