A new scintillation crystal, cerium-doped lutetium oxyorthosilicate &SO) was recently discovered a, with light intensity 75 % of NaI(Tl), scintillation decay time of 12 ns (30%) and 42 ns (70%), effective Z of 66, and density of 7.4 glcc. The fast decay time and scintillation light output of LSO are superior to those of BGO for PET and the stopping power of LSO for 511 keV photons is only sligh...

The calorimetric and fluorescence properties of Bismuth Germanate are discussed and compared to those of NaI(TI1). Results on the energy resolution of BGO are presented for energies up to 50 MeV; the energy and position resolution are studied by Montecarlos at higher energies. The performance of a 4x BGO e.m. calorimeter is compared to that of NaI and is specified for a compact fieldless calori...

An improved calibration technique based on a radio-frequency-quadrupole (RFQ) accelerator is presented. A high-intensity flux of 17.6 MeV photons, produced by radiative capture of 1.85 MeV protons from the RFQ in a lithium target, is used to calibrate 11000 crystals of the L3 BGO calorimeter. In this paper, we present results obtained for the calibration of 1997 and 1998 L3 data samples. For th...

A precise method for the detection of the two photons from the π 0 decay in hypernuclear spectroscopy An experimental technique for the light Λ-hypernuclei structure studies by using (K − , π 0) reaction and Neutral Meson Spectrometer (NMS) developed at the BNL has been described. Position dependence calibration of the BGO conversion planes of the NMS was invented as the solution to the crucial...

Bismuth germanate (BGO) and barium fluoride (BaF2) scintillators are presently used in positron emission tomegraphy (PET) cameras. This study evaluates the important PET performance parameters of image resolution, true sensitivity, scatter background, accidental background, and realistic maximum radioactivity in the field of view for both BGO and BaF2 in an identical non-time-of-flight, whole-b...

Technological Educational Institute of Athens, Athens, Greece The purpose of this study is to investigate the behavior of the new generation of SensL SiPM arrays, ArrayB and ArrayM, for PET/MR applications. The evaluation of the SiPMs performance underwent with pixelated GaGG and BGO scintillators with 2×2×5 mm pixel size and various coupling schemes for 511keV and 662keV energies. To acquire r...

The anticoincidence shield (ACS) of the INTEGRAL-spectrometer SPI consists of 512 kg of BGO crystals. This massive scintillator allows the measurement of gamma-ray bursts (GRBs) with a very high sensitivity. Estimations have shown that with the ACS some hundred gamma-ray bursts per year on the 5 σ level can be detected, having an equivalent sensitivity to BATSE. The GRB detection will be part o...

In this theoretical–experimental study, we use the Fresnel–Kirchhoff diffraction theory to simulate formation of far-field pattern a divergent Gaussian beam propagated through photorefractive crystal Bi 12 GeO 20 (BGO). We show that for BGO, in addition wavefront curvature and change refractive index medium due light intensity, there is third contribution affecting medium-induced nonlinear phas...