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Radon (222Rn) exposure is evident health hazard in a substantial number of underground mines. Exposure to thoron (220Rn) is usually considered to be of secondary importance, but radiation data regarding 220Rn is very scarce compared to that for 222Rn. In planning area and personal monitoring in underground places (mines and caves) 220Rn issue should be addressed at least for two reasons: (1) to revise...
Large array of macro-calorimeter detectors, operated at very low cryogenics temperatures, plays a crucial role for the search of rare events, such as Neutrinoless Double Beta Decay and Dark Matter. In experiments of this type the stability of the system is mandatory over many years of data taking, often in conflict with the intrinsic instabilities of the cryogenic setups. A solution to accomplish...
The European X-ray Free Electron Laser is a high-intensity X-ray light source currently being constructed in the Hamburg region that will provide spatially coherent X-rays in the energy range between 0.25 keV–25 keV. The LPD, DSSC and AGIPD detectors are being developed to provide megapixel imaging capabilities with a dynamic range spanning from single photon sensitivity to 105 photons per pixel....
In the present work, we have made Monte Carlo simulations of the response of 1″ × 1″ LaCb(Ce) and 1″ × 1″ LaBn(Ce) scintillation detectors using the radioactive sources emitting two gamma rays in cascade, namely, 60Co, 94Nb, 46Sc and 24Na for different values of source-detector separation. These simulations were done using GEANT4 toolkit that include radioactive decay module and general particle source...
The existing SPECT system for nuclear cardiac imaging suffered from low sensitivity or high cost. In this study we implemented a novel design of the stationary dedicated cardiac SPECT combined with multi-pinhole collimators based on the clinical dual-head scanner with low cost. Previous simulation study has demonstrated the feasibility of the design. Accurate geometry calibration was implemented for...
The DSSC (DEPFET Sensor with Signal Compression) is a new instrument with non-linear compression of the input signal and with parallel signal processing (filtering, linear amplification, and 8/9-bit digitization) for all pixels. The DSSC will serve as ultra-fast 2d megapixel imaging detector at the European XFEL (X-ray Free Electron Laser) currently under construction in Hamburg, Germany. The DSSC...
The DEPFET Sensor with Signal Compression (DSSC) will be a 2d 1Mpx imaging detector for the European X-ray Free Electron Laser facility (XFEL.EU), that is currently under construction in Hamburg. The DSSC is foreseen as a photon counting detector for soft X-ray radiation from 0.5 keV up to 6 keV. Driven by its scientific requirements, the design goals of the detector system are foremost low noise,...
A CdTe detector equipped with Timepix can work in both counting mode and time over threshold (TOT) mode. When it works in TOT mode, the count recorded in each pixel represents the amount of collected charge. TOT mode provides an easy and direct way to measure the spectra of sources. A pixelated detector in TOT mode also makes it possible to observe and analyze charge sharing between pixels. The energy...
In the reconstruction, the misaligned geometry will cause streak artifacts which influence image quality. Here we propose a method to calibrate all the parameters simultaneously with the matrix form. In some cases, the relative position between the X-ray source and the detector is known and invariant, and then we can build a Cartesian coordinate system for the source and the detector. At the same...
The European X-ray Free Electron Laser is a high-intensity X-ray light source currently being constructed in the Hamburg region that will provide spatially coherent X-rays in the energy range between 0.25 keV–25 keV. The machine will deliver 10 trains/s, consisting of up to 2700 pulses, with a 4.5 MHz repetition rate. The LPD, DSSC and AGIPD detectors are being developed to provide high dynamic range...
An automatic calibration process for the LabPET II detector front-end module has been developed. By aiming at sub-millimetric spatial resolution, an unprecedented channel density is reached. The new detector front-end module is based on an application-specific integrated circuit (ASIC) implementing a Time-over-Threshold (ToT) scheme to extract both energy and time information. Consequently manual...
One of the main benefits of PET/CT imaging is its ability for absolute quantification. Calibration according to the manufacturer's procedure specifies an accuracy of about 10%, whereas especially in dynamic clinical studies a higher quantification accuracy is desired. Therefore a more accurate calibration is needed. At the Gemini TF, a scanner with pix-elated large-area LYSO detectors, there are differences...
High-resolution CBμCT imaging requires complex mechanical configurations that need advanced calibration procedures in order to obtain the best image quality. This work proposes a workflow for the complete geometrical calibration and characterization of a cone beam micro-CT system. Our implementation modifies methods described in previous works with updated enhancements and increased degrees of freedom...
The laser calibration system of the ATLAS Tile hadron calorimeter for the LHC run II is presented. The performances of the calibration and monitor tools internal to the laser system are given in terms of operation time stability. The use of the laser system in the normal Tile calibration procedures is also described.
Gamma Ray Bursts (GRBs) are the strongest explosions in the universe which might be associated with creation of black holes. Magnetic field structure and burst dynamics may influence polarization of the emitted gamma-rays. Precise polarization detection can be an ultimate tool to unveil the true GRB mechanism. POLAR is a space-borne Compton scattering detector for precise measurements of the GRB polarization...
We successfully evaluated the possibility of using a pulsed monoenergetic proton beam as a diagnostic tool for semiconductor detectors' response mapping at high charge densities. In order to ease the setup of the detector under test we explored the opportunity of performing tests with protons in air. We qualified a polyimide film window (Upilex-S, 7.5 μm nominal thickness) as proton extraction window...
The KLOE-2 Inner Tracker, the first fully-cylindrical GEM detector ever built, is being commissioned at the Frascati Laboratory of INFN. KLOE-2 is the first experiment exploiting GEM technology with cylindrical geometry. Tracking performance of this novel detector are being studied using both cosmic-ray muon and Bhabha scattering events. Alignment and calibration procedures to reach design spatial...
The Compton Spectrometer and Imager (COSI) is a balloon-borne soft gamma-ray (0.2 to 5 MeV) telescope designed to perform wide-field imaging, high-resolution spectroscopy, and novel polarization measurements of astrophysical sources. COSI employs a compact Compton telescope design, utilizing 12 cross-strip germanium detectors to track the trajectory of incident photons, where position and energy deposits...
The time-correlated pulse-height (TCPH) distribution can be used to differentiate between multiplying (e.g 235U, 239Pu) and non-multiplying (e.g Am-Li, 252Cf) sources. In the past, this approach proved effective at characterizing the multiplication of alpha phase plutonium metal through a passive measurement. Recently, Sandia National Laboratories has completed a measurement campaign with its new...
Hemodialysis machine, regarded as an important clinical application of regular dialysis therapy, is a necessary equipment for the treatments of uremia patients as well as blood poisoning patients. Currently, medical device manufacturers as well as metrology measurement agencies in China usually use hemodialysis machine detectors as the commonly accepted functional calibration equipment for hemodialysis...
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