983 research outputs found
Editorial
No full textEditoriale dei Proceedings del 9th Topical Seminar on Innovative Particle and Radiation Detectors 23 - 26 May 2004 Siena, Ital
Searches for exotica at LEP
No full textThe results of various searches for new physical phenomena beyond the Standard Model using data from the four LEP experiments are summarized. Topics presented include the search for flavour-changing neutral currents with single top production, compositeness leading to the production of excited leptons, and manifestations of extra dimensions.The results of various searches for new physical phenomena beyond the Standard Model using data from the four LEP experiments are summarized. Topics presented include the search for flavour-changing neutral currents with single top production, compositeness leading to the production of excited leptons, and manifestations of extra dimensions
Innovative Particle and Radiation Detectors 2004
No full textThe Seminar is the ninth in a series devoted since 20 years to experimental apparatus for high-energy particle physics and astrophysics. The previous ones were held in San Miniato (1984, 1986, 1988, 1990, 1993, 1996, 1998) and in Siena (2002). The 2004 Seminar will focus on advanced technologies in particle physics at collider experiments, and in cosmic ray and astrophysics experiments, in particular balloon-borne and space based experiments. Special attention will be devoted to the application of these detectors in other fields, such as detectors for medicine and biology, security control, and environmental monitoring. The participation of representatives from industry will make it possible to discuss future applications of basic research. The Seminar will be based on review talks summarizing the progress of complex R&D projects and major facilities. Shorter talks will cover contributions on specific items. The presentation of posters is also foreseen.
MAIN TOPICS
* Tracking detectors
* Calorimeters
* Detectors for X and gamma ray astrophysics
* Cosmic ray experiments in space, on the earth's surface, and underground
* Neutrino experiments
* Radiation-hard detectors and electronics
* Detectors for medicine and biology
* Large X-ray systems for security control
* Simulations and new computing methods
* Detectors for environmental control
Innovative Particle and Radiation Detectors. Proceedings of the 10th Topical Seminar on Innovative Particle and Radiation Detectors
No full textPulse height non-linearity in LaBr3:Ce crystal for gamma ray spectrometry and imaging
No full textIn this paper the response in term of pulse height linearity of two Hamamatsu photomultipliers is investigated, when coupled to a LaBr3:Ce scintillation crystal. The two photodetectors have high quantum efficiency and in particular 30% for R6231-01 and 42% for R7600-200 tube. The substantial difference is in the dynode structure, linear focused and metal channel for R6231 and R7600 respectively. In this work in order to verify the non-linearity effects on the pulse height distribution, due principally to the high and fast light production of LaBr3:Ce scintillator, we propose a 'peak by peak' procedure to calibrate the pulse height distribution. Utilizing a specific fragmentation of the calibration curve in subsets, the calculated energy values are very similar for both PMTs. This result confirmed the potentiality of the procedure to highlight the non-linearity effects on pulse height distribution. © 2011 Elsevier B.V
Investigation on a small FoV gamma camera based on LaBr3:Ce continuous crystal
No full textRecently scintillating crystals with high light yield coupled to photodetectors with high quantum effciency have been opening a new way to make gamma cameras with superior performances based on continuous crystals. In this work we propose the analysis of a gamma camera based on a continuous LaBr3:Ce crystal coupled to a multi-anodes photomultiplier tube (MA-PMT). In particular we take into account four detector configurations,
different in crystal thicknesses and assembling. We utilize a new position algorithm to reduce the position non linearity affecting intrinsic spatial resolution of small FoV gamma cameras when standard Anger algorithm is applied. The experimental data are obtained scanning the detectors with 0.4 mm collimated 99mTc source, at 1.5 mm step. An improvement in position linearity and spatial resolution of about a factor two is obtained with the
new algorithm. The best values in terms of spatial resolution were 0.90 mm, 0.95 mm and 1.80 mm for integral assembled, 4.0 mm thick and 10 mm thick LaBr3:Ce crystal respectively
A dual modality ultrasound-gamma system: first preliminary results of the scintigraphic camera
No full textThe ECORAD collaboration aims to develop a dual compact camera for acquiring ultrasound and scintigraphic images, in order to get both morphological and functional information on the same device. A final volumetric image containing the fusion information will be provided to the user. Here we present the first simulated results of the scintigraphic camera, achieved by means of the CEANT4 program. The camera is based on a four-segment slant collimator. Each segment is coupled with a planar LaBT(3)(Ce) scintillator and to a Position Sensitive Photo-Multiplier Tube. We tested two different centroid algorithms for reconstructing the planar images. The 3D information is recovered from the planar images acquired at each position of the rotating collimator by using a simple back-projection algorithm. The proposed approach of a scintigraphic camera based on slant collimators is able to recover the location and the depth of a lesion in a very accurate way
A dual-modality ultrasound-gamma system: Monte Carlo simulations of the scintillation imager
No full textThe aim of the ECORAD collaboration is to develop a dual integrated compact and portable camera able to acquire ultrasound and scintigraphic images at the same time. In this work, we present some simulated results of the scintigraphic part of the system. This camera consists of a rotating slant collimator with four segments connected to a planar LaBr3:Ce scintillator and to a PMT Hamamatsu Flat Panel H8500. Simulations are achieved by means of the GEANT4 program. The volumetric information is reconstructed from the planar images acquired at each position of the rotating collimator by means of a simple back-projection method. Results showed that the planar spatial resolution is better that the axial one. First preliminary results suggest that the detection limit of the camera is about 15:1 (in terms of Tumor/Background ratio) for a spherical tumor with 8 mm diameter located at 3 cm distance from the collimator. This confirms that with our approach it is feasible to develop a compact camera able to recover the 3D position of lesions located at small depths (up to some centimeters), without the need of rotating the camera around the body. (C) 2009 Elsevier B.V. All rights reserved
First results on the study of reaction at q2 = - 4.2 (GeV/c)2
No full textHere are reported the preliminary results of experiment PS170 at LEAR, at CERN, concerning e+e- production by p pbar annihilatio
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