Comparison of Analog and Digital Readout Electronics on the Processing of Charge-Sharing Events in Pixelated CdZnTe Detectors

We present our results from testing 15×15×10 mm3 CdZnTe pixelated detectors using a readout system based on the H3D ASIC. Data obtained with an uncollimated 137Cs source helped reveal details of the operational principle of such devices, and how the pulse-processing electronics may influence their performance. The responses of individual pixels were compared by using two different pulse processing approaches based on the analog shaping (H3D ASIC) and fitting of the waveforms as read out from hybrid preamplifiers.

[1]  C. Budtz-Jørgensen,et al.  CdZnTe drift detector with correction for hole trapping , 1998 .

[2]  D. Wehe,et al.  3-D position sensitive CdZnTe gamma-ray spectrometers , 1999 .

[3]  F. Harrison,et al.  CHARGE LOSS BETWEEN CONTACTS OF CDZNTE PIXEL DETECTORS , 1999 .

[4]  Aleksey E. Bolotnikov,et al.  Optimal contact geometry for CdZnTe pixel detectors , 2000, SPIE Optics + Photonics.

[5]  F. Harrison,et al.  Numerical modelling of charge-sharing in CdZnTe pixel detectors , 2000, 2000 IEEE Nuclear Science Symposium. Conference Record (Cat. No.00CH37149).

[6]  C. M. H. Chen,et al.  Investigation optimal contact geometry for CdZnTe pixel detectors , 2000 .

[7]  A. E. Bolotnikov,et al.  Performance studies of CdZnTe detector by using a pulse shape analysis , 2005, SPIE Optics + Photonics.

[8]  Y. Cui,et al.  Characterizations and measurements of CZT material: novel techniques and results , 2007, SPIE Optical Engineering + Applications.

[9]  A. Dragone,et al.  Readout ASIC for 3D position-sensitive detectors , 2007, 2007 IEEE Nuclear Science Symposium Conference Record.

[10]  A. Dragone,et al.  Readout ASIC for 3D Position-Sensitive Detectors , 2008, IEEE Transactions on Nuclear Science.

[11]  G. Knoll.  Radiation Detection And Measurement, 3rd Ed , 2009 .

[12]  F. Zhang,et al.  ASIC for High Rate 3D Position Sensitive Detectors , 2009, IEEE Transactions on Nuclear Science.

[13]  M. Heffner.  A Time Projection Chamber for Precision ^ , 2010 .

[14]  F. Zhang,et al.  Characterization of the H3D ASIC Readout System and 6.0 cm$^{3}$ 3-D Position Sensitive CdZnTe Detectors , 2012, IEEE Transactions on Nuclear Science.