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A new method using a stopped cosmic-ray beam for the calibration of an electro-magnetic calorimeter which consists of several hundreds of modules has been established. Cosmic muons stop in the calorimeter, and positrons (and electrons) from the muon decays with the maximum energy of 53 MeV are used for the energy calibration. These events could be identified as double pulses observed by a flash ADC...
Lu2xGd2(1-x)SiO5:Ce single crystal scintillators (LGSO) with higher Lu content (x=0.9) manufactured by Hitachi Chemical has been attractive for PET (Positron Emission Tomography) detector in its remarkable scintillation properties. While we improve the LGSO:Ce characteristics in the recent years, we have investigated Pr activator instead of Ce activator in LGSO as feasibility study of new scintillator...
Since its discovery in 1993, LGSO has been seen as a promising scintillator for positron emission tomography (PET) imaging. Recently, new high lutetium content Lu1.8Gd0.2SiO5:Ce (LGSO-90%Lu) has been produced with Ce concentration varying from 0.025 to 0.75 mol% Ce, yielding decay times in the range of 34.2 to 44.8 ns. These scintillators could potentially be used as phoswich detectors in PET for...
New high lutetium content Lu1.8Gd0.2SiO5:Ce (LGSO) scintillators with promising physical properties for PET, but also for SPECT and X-ray counting CT applications, have recently been developed. The new crystals have a high density (7.3 g/cc), high light output (>90% of NaI(Tl)), suitable emission wavelength for APD readout (420, 480 nm), and fast decay time that can be adjusted from 34 to 45 ns...
The recent introduction of several new fast, high light yield versions of generic cerium-doped lutetium silicates (LSO, LGSO, LYSO...) has widened the list of potential candidates for phoswich detectors dedicated to medical imaging applications. Furthermore, digital signal processing methods based on adaptive filter theory now provide powerful approaches for crystal identification, even with scintillators...
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