High-Efficiency CdZnTe Gamma-Ray Detectors

摘要: The longer electron lifetime of today’s CdZnTe (CZT) crystals allows for free carriers to travel distances in the crystals, which means that, principle, thicker devices could be fabricated. These CZT would offer greater detection efficiency high-energy gamma-ray detectors. However, up now, thicknesses and sizes actual detectors have still been limited by nonuniform detector response, biggest reported literature are ${(20\times 20\times 15)}\hbox{-mm}^3$ pixelated with a drift distance 15 mm. Although bigger single becoming available today, high requirements on their crystal quality drastically reduce acceptance yield increase cost. Fortunately, many cases, inhomogeneity response can corrected segmenting active volumes correcting responses generated from each voxels. Such high-granularity position-sensitive open opportunity using less-expensive crystals. goal this work is demonstrate that commercial mobility-lifetime material suitable new class 20-25-mm even larger near future, provided detectors’ nonuniformities scale comparable or than clouds, $\sim 100~\mu\hbox{m}$ .