Browse > Article
http://dx.doi.org/10.5516/NET.2011.43.6.567

SENSITIVITY ANALYSIS TO EVALUATE THE TRANSPORT PROPERTIES OF CdZnTe DETECTORS USING ALPHA PARTICLES AND LOW-ENERGY GAMMA-RAYS  

Kim, Kyung-O (Department of Nuclear Engineering, Hanyang University)
Ahn, Woo-Sang (Department of Radiation Oncology, Asan Medical Center)
Kwon, Tae-Je (Department of Nuclear Engineering, Hanyang University)
Kim, Soon-Young (RADCORE Co., Ltd.)
Kim, Jong-Kyung (Department of Nuclear Engineering, Hanyang University)
Ha, Jang-Ho (Advanced Radiation Detection Instrument & Sensor Lab, Korea Atomic Energy Research Institute)
Publication Information
Nuclear Engineering and Technology / v.43, no.6, 2011 , pp. 567-572 More about this Journal
Abstract
A sensitivity analysis of the methods used to evaluate the transport properties of a CdZnTe detector was performed using two different radiations (${\alpha}$ particle and gamma-ray) emitted from an $^{241}Am$ source. The mobility-lifetime products of the electron-hole pair in a planar CZT detector ($5{\times}5{\times}2\;mm^3$) were determined by fitting the peak position as a function of biased voltage data to the Hecht equation. To verify the accuracy of these products derived from ${\alpha}$ particles and low-energy gamma-rays, an energy spectrum considering the transport property of the CZT detector was simulated through a combination of the deposited energy and the charge collection efficiency at a specific position. It was found that the shaping time of the amplifier module significantly affects the determination of the (${\mu}{\tau}$) products; the ${\alpha}$ particle method was stabilized with an increase in the shaping time and was less sensitive to this change compared to when the gamma-ray method was used. In the case of the simulated energy spectrum with transport properties evaluated by the ${\alpha}$ particle method, the peak position and tail were slightly different from the measured result, whereas the energy spectrum derived from the low-energy gamma-ray was in good agreement with the experimental results. From these results, it was confirmed that low-energy gamma-rays are more useful when seeking to obtain the transport properties of carriers than ${\alpha}$ particles because the methods that use gamma-rays are less influenced by the surface condition of the CZT detector. Furthermore, the analysis system employed in this study, which was configured by a combination of Monte Carlo simulation and the Hecht model, is expected to be highly applicable to the study of the characteristics of CZT detectors.
Keywords
Semiconductor Detector; CdZnTe; Hecht Equation; Charge Collection Efficiency; Tail Effect;
Citations & Related Records

Times Cited By Web Of Science : 0  (Related Records In Web of Science)
Times Cited By SCOPUS : 0
연도 인용수 순위
  • Reference
1 Y. Nemirovsky, A. Ruzin, G. Asa, and J. Gorelik, "Study of the Charge Collection Efficiency of CdZnTe Radiation Detectors," Journal of Electronic Materials, 25 1221-1231 (1996).   DOI   ScienceOn
2 J. E. Toney, T. E. Schlesinger, and R. B. James, "Modeling and Simulation of Uniformity Effects in Cd1-xZnxTe Gamma-ray Spectrometers," IEEE Transactions on Nuclear Science, 45, 105-113 (1998).   DOI   ScienceOn
3 M. C. Veale, P. J. Sellin, A. Lohstroh, A. W. Davies, J. Parkin, and P. Seller, "X-ray Spectroscopy and Charge Transport Properties of CdZnTe Grown by the Vertical Bridgman Method," Nuclear Instruments and Methods in Physics Research A, 576, 90-94 (2007).   DOI   ScienceOn
4 Se-Hwan Park, Yong-Kyun Kim, Sung-Dae Jeon, Jang- Ho Ha, and Duk-Geun Hong, "Mean Free Paths of Charge Carriers in CZT Crystal," Nuclear Instruments and Methods in Physics Research A, 579, 130-133 (2007).   DOI   ScienceOn
5 D. Pelowitz (Ed.), "MCNPX User's Manual Version 2.5.0," LA-CP-05-0369, Los Alamos National Laboratory, (2005).
6 M. D. Reed, Cs. Szeles, and S. E. Cameron, "Computational Modeling of Heat Transport in a Multi-zone High-pressure Vertical Electro-dynamic Gradient CdZnTe Furnace," Journal of Crystal Growth, 289, 494-501 (2006).   DOI   ScienceOn
7 K. Hecht, "Zum Mechanismus des lichtelekrischen Primastomes in isolierenden Kristallen," Zeits. Phys., 77, 235- (1932).   DOI
8 Goro Sato, and et al., "Properties of CdZnTe Detectors in the burst alert telescope (BAT) Array," Proceedings of SPIE-International Society for Optical Engineering, 5198, 209-216 (2004).
9 eV Products, http://www.evproducts.com/.
10 Goro Sato, Tadayuki Takahashi, and et al., "Characterization of CdTe/CdZnTe Detectors," IEEE Transactions on Nuclear Science, 49[3], 1258-1263 (2002).   DOI   ScienceOn
11 J. E. Toney, R. B. James, J. Butler, and et al., Cadmium Zinc Telluride Charged Particle Nuclear Detectors, SAND97- 8216, Sandia National Laboratories, (1997).
12 Hadong Kim, Leonard Cirignano, Kanai Shah, Michael Squillante, and Philip Wong, "Investigation of the Energy Resolution and Charge Collection Efficiency of Cd(Zn)Te Detectors with Three Electrodes," IEEE Transactions on Nuclear Science, 51[3], 1229-1234 (2004).   DOI
13 A. K. Khusainov, A. L. Dudin, A. G. Ilves, V. F. Morozov, A. K. Pusotovoit, and R. D. Arlt, "High Performance P-i-n CdTe and CdZnTe Detectors," Nuclear Instruments and Methods in Physics Research A, 428, 58-65 (1999).   DOI   ScienceOn
14 B. A. Brunett, J. M. Van Scyoc, N. R. Hilton, J. C. Lund, and R. B. James, "The Performance Effects of Crystal Boundaries in Cadmium Zinc Telluride Radiation Spectrometers," IEEE Transactions on Nuclear Science, 47[4], 1353-1359 (2000).   DOI   ScienceOn
15 K. S. Shah, J. C. Lund, and F. Olschner, "Charge Collection Efficiency in a Semiconductor Radiation Detector with a Non-constant Electric Field," IEEE Transactions on Nuclear Science, 37[2], 183-186 (1990).   DOI   ScienceOn
16 T. E. Schlesinger, J. E. Toney, H. Yoon, E. Y. Lee, B. A. Brunett, L. Franks, and R. B. James, "Cadmium Zinc Telluride and Its Use as a Nuclear Radiation Detector Material," Materials Science and Engineering, 32, 103- 189 (2001).   DOI   ScienceOn
17 M. Jung, J. Morel, P. Fougeres, M. Hage-Ali, and P. Siffert, "A New Method for Evaluation of Transport Properties in CdTe and CZT Detectors," Nuclear Instruments and Methods in Physics Research A, 428, 45-57 (1999).   DOI   ScienceOn