17 October 2012 Crystalline microcolumnar CsI:Tl films for use in gamma-ray imaging with depth-of-interaction sensitivity
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Columnar, amorphous CsI:Tl scintillators are attractive for biomedical imaging applications because they allow high spatial resolution with EMCCD detectors and BazookaSPECT. But these scintillators have a serious practical limitation, they are not useful in thickness larger than 0.5 mm, because of attenuation; this means that detection efficiencies are very poor for ≥100 keV gamma rays. The development of a new crystalline microcolumnar scintillator (CMS) of CsI:Tl is described. CMS CsI:Tl has high density and greatly improved light transmission properties. CMS films were prepared in three thicknesses (0.5 mm, 1.0 mm and 4.0 mm), and test results for these films are described. The light yield and energy resolution for 0.5 mm, CMS CsI:Tl films was equivalent to that of conventional bulk CsI:Tl scintillators; while some light attenuation was seen in 4 mm-thick CMS CsI:Tl samples, useable photopeaks were obtained at 122 keV. The spatial resolution measured for the 0.5 mm and 1.0 mm films in a BazookaSPECT system was excellent, 150-200 μm. Imaging tests with the 4 mm-thick CMS CsI:Tl films in a BazookaSPECT system with 662 keV gamma rays showed progressive broadening of the signal clusters on the CCD camera with depth of interaction (DOI), indicating that DOI determination should be possible with these detectors, i.e. 3D detector operation. Future planned investigations are described.
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Harish Bhandari, H. Bradford Barber, Christopher Dumas, Haris Kudrolli, Brian W. Miller, George T. L. Chac, Ling Han, and Vivek V. Nagarkar "Crystalline microcolumnar CsI:Tl films for use in gamma-ray imaging with depth-of-interaction sensitivity", Proc. SPIE 8508, Medical Applications of Radiation Detectors II, 85080A (17 October 2012); doi: 10.1117/12.966196; https://doi.org/10.1117/12.966196


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