The Influence of Pixel Pitch and Electrode Pad Size on the Spectroscopic Performance of a Photon Counting Pixel Detector With CdTe Sensor

被引：19

作者：

Guni, Ewald ^{[1
]}

Durst, Juergen ^{[1
]}

Kreisler, Bjoern ^{[1
]}

Michel, Thilo ^{[1
]}

Anton, Gisela ^{[1
]}

Fiederle, Michael ^{[2
]}

Fauler, Alex ^{[2
]}

Zwerger, Andreas ^{[2
]}

机构：

[1] Erlangen Ctr Astroparticle Phys, D-91058 Erlangen, Germany

[2] Freiburg Mat Res Ctr, D-79104 Freiburg, Germany

来源：

IEEE TRANSACTIONS ON NUCLEAR SCIENCE | 2011年 / 58卷 / 01期

关键词：

CdTe; electrode pad; medipix; photon counting; pixel detector; pixel pitch; X-ray; CHARGE; MEDIPIX2;

D O I：

10.1109/TNS.2010.2095883

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The quality and availability of room temperature CdTe sensor material for X-ray detection has improved significantly in the last years. A CdTe sensor with different pixel pitches and electrode pad sizes was bump-bonded to a Medipix2-MXR ASIC. With this photon counting detector we were able to investigate the influence of pixel pitch and electrode pad size on the energy response functions. The accurate knowledge of the energy response is crucial for energy resolving X-ray imaging. Therefore we exposed the detector to gamma rays of (241)Am and (57)Co. In the following analysis of the energy response spectra we determined the number of events in the photo peak, the energy resolution and the threshold energy where the photo peak is found (photo peak position) caused by the absorption of the 59.5 keV photons of (241)Am. For the energy calibration we used the 59.5 keV photons of (241)Am and the 122 keV photons of (57)Co. Concerning energy resolution, energy threshold calibration and photo peak position our measurements show good agreement with the expected behaviour. The number of events in the photo peak strongly depends on the pixel pitch and the electrode pad configuration.

引用

页码：17 / 25

页数：9

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