Polarization Studies of CdZnTe Detectors Using Synchrotron X-ray Radiation

Journal Article · Tue Jan 01 04:00:00 EST 2008 · IEEE Transactions on Nuclear Science

DOI:https://doi.org/10.1109/TNS.2008.2004707· OSTI ID:980392

Camarda, G; Bolotnikov, A; Cui, Y; Hossain, A; Awadalla, S; MacKenzie, J; Chen, H; James, R

High densities of impurities and defects lead to severe charge-carrier trapping that can be major issues in assuring the high performance of CZT detectors. For some medical-imaging applications, the typical X-ray flux can be very high. Under such high irradiation conditions, the trapped charge builds up inside the detector affecting its stability. This phenomenon generally is termed the polarization effect. We conducted detailed studies on polarization in CZT crystals employing a highly collimated synchrotron X-ray radiation source available at Brookhaven's National Synchrotron Light Source (NSLS). We were able to induce polarization effects by irradiating specific areas within the detector. These measurements allowed us to make, for the first time, a quantitative comparison between areas where polarization is induced, and the electron- and hole-collection X-ray maps obtained at low flux, where no polarization is induced. We discuss the results of these polarization studies.

• Research Organization: Brookhaven National Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 980392
• Report Number(s): BNL--93310-2010-JA
• Journal Information: IEEE Transactions on Nuclear Science, Journal Name: IEEE Transactions on Nuclear Science Journal Issue: 6 Vol. 55; ISSN 0018-9499; ISSN IETNAE
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
CADMIUM
CHARGE CARRIERS
CRYSTALS
DEFECTS
IMPURITIES
IRRADIATION
NSLS
PERFORMANCE
POLARIZATION
RADIATION SOURCES
RADIATIONS
SEMICONDUCTOR DETECTORS
STABILITY
SYNCHROTRONS
TELLURIDES
TRAPPING
ZINC
national synchrotron light source