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We present a digital system for measurement of neutron spectra in mixed gamma-neutron fields. The signal from a standard scintillation detector is sampled at rate up to 1 GHz, using 12-bit analog-to-digital converters. First stage of the signal processing is performed on a Virtex 6 FPGA and partial results are streamed through a fast Ethernet link to a computer, where the final processing takes place...
In this work, we apply Nonnegative Matrix Factorization (NMF) algorithms of the blind source separation methods to extract independent components from signals recorded at the output of fission chamber detector, which is used to perform the flux-mapping within the nuclear research reactors. The simulation of the recorded signals is based on using the python-based of Fission Chambers (pyFC) suite code,...
Most of the electricity produced in nuclear power plants comes from pressurized water nuclear reactors. Currently, the main fuel of pressurized water nuclear reactors is enriched uranium. The thermal energy is produced by fission of uranium 235 using slow (thermal) neutrons. Generation IV reactors are already contemplate obtaining thermal energy from the fission of uranium 238 using fast neutron....
In-core flux measurement is critical for monitoring and power regulation of a large core nuclear reactor. Self Powered Neutron Detectors (SPNDs) are used for measuring the neutron flux in a nuclear reactor. In this paper we propose an online method for SPND gross error detection, identification and estimation. The method uses linear models which are extracted from data and which adapt continuously...
In previous projects funded by the DOE, Proportional Technologies, Inc. developed the basic design of a neutron imaging detector, based on the boron-coated straw technology, aimed to replace 3He tubes in large-scale neutron science instruments. Recent efforts have focused on automated production methods, including a critical 10B4C high volume sputter coating system, and automated in-line straw tube...
The need for simultaneous neutron and gamma detection continues to motivate the development of dual mode radiation detectors. One promising candidate is the elpasolite inorganic scintillator Cs2LiYCl6:Ce (CLYC). Previous studies, with other dual neutron–gamma detectors (EJ-299/EJ-309), have shown that the choice of digital data acquisition (DAQ) system can significantly affect pulse shape discrimination...
Silicon photomultipliers (SiPMs) are a good alternative to photomultiplier tubes (PMTs) because their gain and quantum efficiency are comparable to PMTs. However, the largest single-chip SiPM is still less than 1 cm2. In order to use SiPMs with scintillators that have reasonable sensitivity, it is necessary to use multiple SiPMs. In this work, scintillation detectors are constructed and tested with...
The Space and Endo-Atmospheric Nudet (Nuclear Detonation) Surveillance Experimentation and Risk-Reduction (SENSER) project, scheduled to launch to geosynchronous orbit in 2019, contains several experimental and demonstration systems developed by Los Alamos National Laboratory and Sandia National Laboratories to assess next-generation technologies for space-based national security missions. The CLYC...
Calorimetry at the High Luminosity LHC faces many technical challenges. In the forward direction the levels of radiation and the unprecedented in-time event pileup make detector design and operation particularly difficult. To meet these challenges, the CMS experiment has decided to construct a sampling calorimeter with silicon as the primary active medium. This calorimeter — the High Granularity Calorimeter...
The COMET experiment at J-PARC aims to search for the charged lepton flavor violating process of neutrinoless muon to electron conversion. The goal sensitivity is to be improved by a factor of 10000 to the current limit. In order to achieve the goal sensitivity, we have developed a straw tube tracker as an electron detector which has very high momentum resolution. To read out the signal from the tracker...
Using pulsed neutron imaging, the distributions of absolute values of nuclide densities and temperatures of the sample can be estimated. However, the images obtained by the pulsed neutron imaging have a low spatial resolution because of the performance limitations of the detector. On the other hand, X-ray radiograms have higher spatial resolution compared with the neutron images. To obtain higher-resolution...
The aim of the SPRINTER detector development is to produce a high counting rate detector capable of replacing the existing 3He tube currently used on the INTER reflectometer of the ISIS spallation neutron source. The detector utilises microstrip gas chamber (MSGC) technology as this affords a much greater rate capability compared to the single wire gas tube before saturation effects occur. The initial...
This paper reports a feasibility study, performed by numerical simulation with MCNPX PoliMi v2.0, for plutonium characterization in radioactive waste packages by passive neutron coincidence counting with plastic scintillators. Owing to their low cost and good detection efficiency for fast neutrons, these last could indeed constitute a good alternative to 3He proportional counters, now too costly because...
The MEGII Timing Counter will measure the positron time of arrival with a resolution of 30 ps relying on two arrays of scintillator pixels read out by 6144 Silicon Photomultipliers (SiPMs) from AdvanSiD.
Within the framework of the European H2020 C-BORD project, aiming at improving container inspection technologies, a compact and “Rapidly Relocatable Tagged Neutron Inspection System”, called RRTNIS, is being developed taking into account past EURITRACK experience with a portal TNIS, and the latest technologies in terms of associated particle neutron generator and data acquisition electronics. A dedicated...
For several years, detection of various threats on country borders plays a significant role in the frame of Homeland Security applications. One of this threat is the illicit trafficking of nuclear materials (especially including Special Nuclear Material — SNM — 235U, 233U or 239Pu), which can be potentially used for production of nuclear weapon as well as radiological dispersal device (RDD) — known...
The SoLid collaboration aim to search for very short baseline neutrino oscillations using reactor anti-neutrinos. For this purpose, a highly segmented detector was built out of PVT cubes lined with a 6LiF:ZnS(Ag) layer. Unlike neutrino experiments conducted deep underground, neutrino detectors used in a reactor environment are forced to operate in high levels of background radiation. Therefore the...
The response of VPE GaAs detectors with a polyethylene converter under fast neutron irradiation from a 241Am-Be source was measured and simulated. The detection efficiency experimentally obtained was 1.30 · 10−3 puls./neutr. The simulation of the detector characteristics has showed a good agreement with the experimental data and allowed to estimate the maximum theoretical efficiency of polyethylene...
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...
Muon scattering tomography techniques can be used to image the contents of an enclosed volume by measuring the scattering angle of cosmic ray muons as they pass through a volume using particle tracking detectors. The magnitude of the observed muon scatter varies with the density of the objects within a volume, therefore the technique is well suited to distinguishing dense (high-Z) materials from lower...
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