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Modeling and response simulation of radiation detectors with Monte Carlo simulation codes are based on the calculation of energy deposition in the detector volume, often obtained by the stochastic process to determine the next event of the incident particle track history in the detector. In this work, we simulated the detector response to gamma rays, by conducting additional simulation processes on...
A portable system has been developed for the detection of neutrons. The sensing element is a silicon radiation detector with a Boron-based converter material that detects neutrons with the 10B(n, α)7 Li reaction. The detector response has been simulated with the MCNPX Monte-Carlo software and the detector geometry has been optimized. A portable readout electronics has been built to operate the detector...
Monte Carlo simulations were carried out in order to evaluate the performance of readout solutions for monolithic LYSO blocks, considering several 2D array configurations of discrete SiPMs. Results were compared to conventional multianode PMT readout. Our findings show that a detector module based on an array of 8×8 discrete SiPM may lead to better energy resolution and comparable spatial resolution...
The Micro-Vertex-Detector (MVD) of the PANDA experiment has been studied and optimized making use of Monte Carlo simulations. A detailed geometry of active and passive components was implemented in the computing framework. This allows to perform an analysis of the geometrical coverage of the detector as well as of its material budget. The components of the MVD have been studied piece by piece and...
In December 2009 the ATLAS experiment at the CERN Large Hadron Collider (LHC) recorded the first proton-proton collisions at a center-of-mass energy of 900 GeV and this was followed by the unprecedented energy of 7 TeV in March 2010. The SemiConductor Tracker (SCT) is the key precision tracking device in ATLAS, made up from silicon microstrip detectors processed in the planar p-in-n technology. The...
The Timepix is a semiconductor pixelated detector that measures charge collected in each of its 256×256 pixels (55 μm pitch). Therefore, it is capable of measuring the energy and position of incoming radiation quanta at the same time. We are developing a spectroscopy and radiography technique for fast-neutrons based on the tracking of recoiled protons. The detector combines a Timepix device with a...
A semiconductor Compton camera with wide-band imaging capability and high energy resolution is expected to provide new in-vivo data that enables tracking of multiple RI-labeled molecular probes. In our previous works, we have constructed prototype Compton cameras composed of Si and CdTe semiconductor detectors, and demonstrated wide-band imaging of 60-662 keV gamma-rays with a spatial resolution on...
Many methods are being developed by scientists, archaeologists and historians to study different aspects of the archaeological samples. The paper presents an advanced non-intrusive technique to identify the type of sample and to predict its provenance by visualising the chemical composition.
The objective of this research is to demonstrate a modified statistical system model and an approach of accelerated Monte Carlo simulation for studying the capability of a dual-planar Compton medical imaging system constructed with silicon and NaI detectors to image 364.4 keV energy photons emitted from I131. The Compton imaging system is a potential medical imaging instrument for effectively observing...
Using GATE, the Geant4 application for tomographic emission, the inter-crystal scatter (ICS) in the LabPET scanner has been characterized with respect to detection efficiency and quantification, for different energy thresholds and gamma ray incidence angles. Simulations have shown that for a direct angle of incidence and an energy threshold of 350 keV, the number of the ICS events is estimated to...
We used silicon photomultipliers coupled to LYSO scintillator crystals in dual-ended readout configuration to evaluate detector performance for depth of interaction (DOI) positron emission tomography (PET) applications. By experiments and Monte Carlo simulation, we investigated the effect of scintillator crystal geometry and surface finishing on DOI, energy and timing resolution. Measurements indicate...
Most neutron detectors use some type of conversion material to convert the incident neutron into secondary charged particles, which can then be detected inside the detector bulk afterward. In this way, semiconductor detectors incorporating neutron reactive material on top of a diode substrate can be used as a neutron detector. These reactions emit charged particles and recoil nucleus with energies...
This work describes an innovative solid state device structure that leverages advanced semiconductor fabrication technology to produce an efficient device for thermal neutron detection which we have coined the ??Pillar Detector??. State-of-the-art thermal neutron detectors have shortcomings in simultaneously achieving high efficiency, low operating voltage while maintaining adequate fieldability performance...
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