Spectral performance of a pixellated X-ray imaging detector with suppressed charge sharing

• The ability to do X-ray imaging with energy resolution on a small pixel detector is severely limited by the charge sharing in the detector. Different schemes to overcome the problem have been proposed. Previous studies using synchrotron radiation have shown that, for a 300 µm thick Si detector, almost no charge sharing occurs for photons hitting the centre of each pixel. In this study we have used slits to focus the beam from a standard X-ray unit on the centre of a pixel on a MEDIPIX detector. The attenuation of the spectrum were measured for a number of samples of different materials with K-edge energy in the range of 30 to 50 keV. The measurements were done by scanning an energy window through the spectrum. Requirements for new X-ray imaging systems with true energy resolution are discussed based on these measurements.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

Keyword

X-ray spectroscopy

Pixel detector

Medipix

Charge sharing

Material recognition

Electrical engineering, electronics and photonics

Elektroteknik, elektronik och fotonik

Publication and Content Type

ref (subject category)

art (subject category)