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The Silicon photomultiplier (SiPM) becomes a choice of photon sensors for advanced radiation detector development. However, reading out large-scale SiPM arrays is still a fundamental technical obstacle. We present a new method (named π-PET electronics) to address this issue. Very different from conventional front-end electronics design, the key innovation of the new electronics is to include almost...
The reflectivity and thickness of optical reflector used in scintillator array influence the performance of PET detector module. In this paper, we designed an ultra-thin multilayer high-reflectivity (HR) film and coated it on the surfaces of ultra-precision polished LYSO scintillators. The HR film consists of three quarter wavelength reflective films with the central wavelengths set at 365nm, 430nm...
ACTIVE-INTERROGATION (AI) systems automatically determine if special nuclear material (SNM) is present in an object (e.g., an intermodal cargo container) by observing the radiation emitted by the object when it has been exposed to an external radiation source. Active interrogation systems range from those that only indicate the presence of high-Z materials, to fissionable material detection, to those...
Cerium doped Tl2LiYCl6 (TLYC) is a new, Tl-based elpasolite scintillation detector. TLYC crystals with 0%, 0.5%, 3%, 5%, and 9% cerium concentrations have been grown. Emission spectra of TLYC with these different Ce concentrations peak between 430 and 445 nm. Energy resolution values of 6.8%, 5.2%, 4.2%, 3.9%, and 4.4% at 662 keV (FWHM) are measured for TLYC doped with 0%Ce, 0.5%Ce, 3%Ce, 5%Ce, and...
The planned HL-LHC (High Luminosity LHC) expected to start in 2025 is being designed to maximise the physics potential of the LHC through a sizeable increase in the luminosity, reaching 1–1035 cm2s−1 after 10 years of operation [1]. A consequence of this increased luminosity is the expected radiation damage at an integrated luminosity of 3000 fb−1, requiring the strip part of the tracking detectors...
– In this presentation, we will discuss crystal growth and scintillation properties of large diameter SrI2:Eu2+ single transparent crystals. The crystals were grown successfully using the vertical Bridgman technique. Crystals with different diameters from 1 inch to 2 inches are discussed. SrI2:Eu2+, a scintillator discovered a half century ago by Hofstadter, was recently re-discovered as an outstanding...
Several beam-profile monitors have been developed for high-energy photon beamlines at the Research Center for Electron Photon Science, Tohoku University, Japan. The position of the photon converted into an electron-positron pair in a metal plate is measured in these monitors. In the current monitor, two layers of 16 scintillating-fiber hodoscopes with a cross section of a 3-mm square have been adopted...
TARANIS (Tool for the Analysis of RAdiation from lightNIng and Sprites) is a microsatellite aimed to atmospheric storms study. It embarks among other instruments IDEE (Instrument Detecteur d'Electron Energetique) which is dedicated to energetic electron characterization in the range from 70keV to 4Mev. To cover such awide ran ge, two types of detectors are required: Silicon (Si) and Cadmium Telluride...
We present the results of a study of the feasibility of implementing real-time track reconstruction within the framework of a pre-existing readout system, using the “Artificial Retina” approach. This is the first attempt at building a complete medium-size prototype of this kind (comprising about 8M Logic Elements, distributed on several separate boards), operating it continuously at its limit speed...
The number of time-bins (TB) in retrospectively gated (4D-) PET/CT should be a trade-off between optimizing statistics and minimizing motion effect. The aim of this work was to investigate the impact of TB in heterogeneity quantification by PET texture features (TF) for lesions affected by respiratory motion. Five heterogeneous lesions were simulated by a mixture of radio-compound and alginate. Realistic...
Soderlund et recently published a sphere-phantom study with six PET tracers, concluding that image quality was good but tracer concentration measurements based on mean uptake (MEAN) were strongly affected by partial volume errors (PVE). In this work we ask if a previously published PVE correction method (CORR, described in 2002 by Hickeson and colleagues) is more accurate. The CORR method may be appropriate...
A cadmium zinc telluride (CZT) based small animal positron emission tomography (PET) system is under development at the Molecular Imaging Instrumentation Laboratory (MIIL) at Stanford University (Fig. 1) [1,2]. A goal for this system is to advance the ability to detect, visualize, and quantify low concentration of molecular probes. Key technologies of this work are: (1) CZT detector technology, instead...
PET is the most sensitive imaging technique in the field of nuclear medicine. However, the single count rate is typically 10 times higher than the coincidence count rate. This means that there are a lot of pairs of undetected annihilation photons. For single gamma imaging, Compton imaging is known as the only method to obtain directional information of an incoming gamma ray without using collimators...
In experimental nuclear physics, HPGe segmented detectors are used to provide high energy resolution of the gamma rays. Besides, 4pi configuration is common to get a full coverage of the interaction point and detection of all the products of the collisions. In this type of experiments, the number of electronic channels can be high (>100) and also the sampling frequency of the digitizing system...
Location-aware mobile sensors have fundamentally changed the ways radiation levels are detected and tracked. These changes have raised many exciting research questions related to nuclear forensics. This paper investigates the relationship between a mobile sensors' velocity and radiation counts. The study compares the correlations of the sensors' velocity and measurment radiation counts with a source...
Gamma-imaging system is of great interest to monitor the contamination of radioactive substances in a wide range of areas at nuclear power plants. The purpose of this study was to develop a compact gamma camera capable of detecting and imaging the radioactive sources present in contaminated area. The prototype of compact gamma camera with 73 × 99 mm2 FOV was composed of pinhole collimator, SiPM based...
We introduce a compact preclinical PET detector that combines the output from 64 SiPM channels, forming an 8×8 matrix of pixels capable of efficiently encoding event position, with good energy and time resolution, as well as depth of interaction information. The scintillator matrices used to characterize the detector are a 16×16 matrix comprised of 1.3×1.3×12mm3 LYSO crystals, and a 1.3×1.3×15mm3...
We characterized the performance of Silicon Photomultipliers (SiPMs) before and after exposure to 1012 neutron/cm2 dosage. Despite the typical orders of magnitude increase of dark current upon neutron irradiation that loss SiPM's photon number resolving capability and deem unusable, we show that the elevated dark current can be suppressed and single-photoelectron detection can be restored by operating...
A demonstrator of the portable position sensitive neutron detecting device for neutron imaging in a mixed radiation field is presented. A detector of the device is based on multilayer perpendicularly crossed strip sensors interlaced with neutron converter. A 6LiF converter producing energetic alpha particles and tritons is used. The converter permits precise determination of a position of the neutron...
Polyethylene 2.6-naphthalate (PEN) as a promising material for ionizing radiation detection have been taken recently into consideration. In this work various particles were detected by scintillation in PEN. Identification of these particles was based on the pulse shape discrimination: ratio of delayed fluorescence intensity with fast fluorescence component. Higher delayed fluorescence yield is induced...
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