Such scaling will make it economically feasible to manufacture thick detectors an advancement that is essential for many applications, but especially for homeland security application.
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But their availability and poor performance has limited their commercial deployment in the higher energy gamma application.
Large-area monolithic CZT detectors that are produced by THM method provide excellent performance. Thicker detectors have also been shown to function well.
Characterization of large CZT crystals grown by travelingtion
To date, CZT crystal has captured considerable interest due to its potential in many applications as a room temperature radiation detector.
In this paper, we discuss the spectral response and electrical properties of the 20×20×10 and 10×10×10 mm3 monolithic pixellated detectors.
Crystal characterization
Although more optimization is required, these results demonstrate that with proper design of the devices, and additional signal-processing correction, sub-1% 662 keV energy resolution is very likely to be achievable in largevolume monolithic pixellated detectors fabricated from crystals of similar quality.
Average pixel response of a single pixel was near 1% FWHM.Under these same conditions, an energy resolution of 2.6% can be achieved.
Use a nonoptimized detector's configuration and test method. If a good correction mechanism, the energy resolution below 1% can be achieved, with the possibility of approaching 0.5%.
IR microscopy and x-ray topography mapping to analyze the Te inclusion,which are the most effective methods of detecting these crystal defects in CZT. The density of both Te inclusion and their sizes is very low.
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The first THM grown 75 mm diameter CZT of 80% single crystals
100% single crystals cut from a 75 mm diameter CZT ingot along the direction of their growth
IR image,the particle (black dots) size less than 5µm
X-ray topography mappings of Te inclusion (a) low contrast (b) high contrast
Spectral performance
at 662 keV ,of a single pixel 20×20×10.5 mm3 monolithic pixellated detector without any additional signal correction
137Cs
122 keV response of a single pixel 11×11×10.5 mm3 monolithic pixellated detector without any additional signal correction(pixel size=2.46 mm)
57Co
Conclusion
This work demonstrates our initial successful results in developing larger volume CZT with high-resolution radiation detectors based on the THM growth process. These results suggest that the process is progressing toward optimized crystal growth and wafer processing and the achievement of reliable production.