Author:
Jowitt L.,Wilson M.,Seller P.,Angelsen C.,Wheater R.M.,Cline B.,Schöne D.,Lauba F.,Goede M.,Ball R.,Verhoeven M.,Gottseleben G.,Boone M.N.,Van Assche F.,Veale M.C.
Abstract
Abstract
HEXITEC is a spectroscopic imaging X-ray detector technology
developed at the STFC Rutherford Appleton Laboratory for X-ray and
γ-ray spectroscopic imaging applications. Each module has
80 × 80 pixels on a 250 μm pixel pitch, and
has been implemented successfully in a number of applications. This
paper presents the HEXITEC 2 × 2 detector system, a tiled
array of 4 HEXITEC modules read out simultaneously, which provides
an active area of 16 cm2. Systems have been produced
using 1 mm thick Cadmium Telluride (CdTe) and 2 mm thick Cadmium
Zinc Telluride (CdZnTe) sensor material. In this paper the system
and data processing methods are presented, and the performance of
the systems are evaluated.
The detectors were energy calibrated using an 241Am
sealed source. Three types of charge sharing correction were applied
to the data-charge sharing addition (CSA), charge sharing
discrimination (CSD), and energy curve correction (ECC) which
compensates for energy lost in the inter-pixel region. ECC recovers
an additional 34 % of counts in the 59.5 keV peak in CdTe
compared to the use of CSD; an important improvement for
photon-starved applications. Due to the high frame rate of the
camera system (6.3 kHz) an additional End of Frame (EOF) correction
was also applied to 6.0 % of events to correct for signals that
were readout whilst the signal was still forming. After correction,
both detector materials were found to have excellent spectroscopic
performance with a mean energy resolution (FWHM) of 1.17 keV and
1.16 keV for CdZnTe and CdTe respectively. These results
successfully demonstrate the ability to construct tiled arrays of
HEXITEC modules to provide larger imaging areas.
Subject
Mathematical Physics,Instrumentation
Cited by
9 articles.
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