E.M. Schooneveld

Science and Technology Facilities Council, Swindon, England, United Kingdom

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Publications (78)86.47 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: We demonstrate for the first time the viability of a three-dimensional (3D) elemental imaging technique based on Neutron Resonance Transmission Imaging (NRTI). NRTI is a neutron technique based on the presence of a resonance structure in the neutron-induced reaction cross sections. These resonances allow the identification of elements and isotopes within an object in a non-destructive manner. A dedicated set-up on the INES (Italian Neutron Experimental Station) beamline of the ISIS spallation neutron source was used for the experiments. An early mediaeval disc fibula from the Hungarian National Museum in Budapest was used for our demonstration. The methodology, analysis procedures are described and results obtained from the reconstruction of the 3D NRTI elemental image of the ancient object are compared with results obtained from other neutron based 3D imaging techniques.
    Journal of Analytical Atomic Spectrometry 12/2014; · 3.40 Impact Factor
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    ABSTRACT: A low-afterglow, 10B-doped neutron-sensitive ZnS/10B2O3 scintillator was developed. The developed ZnS phosphor has a primary decay time constant of about 60 ns with a low afterglow. The developed scintillator exhibited a mean afterglow height of 4% relative to the peak at 1 μs after the peak, which is half that of a commercial ZnS/6LiF scintillator manufactured by Applied Scintillation Technologies. The count-rate capability of a wavelength-shifting-fibre-based detector was increased to 30,000 cps by implementing the developed scintillator from 5,000 cps with the commercial scintillator.
    Journal of Physics Conference Series 07/2014; 528(1):012043.
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    ABSTRACT: The research of reliable substitutes of 3He detectors is an important task for the affordability of new neutron scattering instrumentation for future spallation sources like the European Spallation Source. GEM (Gas Electron Multiplier)-based detectors represent a valid alternative since they can combine high-rate capability, coverage of up to area and good intrinsic spatial resolution (for this detector class it can be better than 0.5 mm). The first neutron diffraction measurements performed using a borated GEM detector are reported. The detector has an active area of and is equipped with a borated cathode. The GEM detector was read out using the standard ISIS Data Acquisition System. The comparison with measurements performed with standard 3He detectors shows that the broadening of the peaks measured on the diffractogram obtained with the GEM is 20–30% wider than the one obtained by 3He tubes but the active area of the GEM is twice that of 3He tubes. The GEM resolution is improved if half of its active area is considered. The signal-to-background ratio of the GEM is about 1.5 to 2 times lower than that of 3He. This measurement proves that GEM detectors can be used for neutron diffraction measurements and paves the way for their use at future neutron spallation sources.
    EPL (Europhysics Letters) 07/2014; 107(1):12001. · 2.27 Impact Factor
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    ABSTRACT: Measurements of the fast neutron energy spectrum at the ISIS spallation source are reported. The measurements were performed with a Proton Recoil Telescope consisting of a thin plastic foil placed in the neutron beam and two scintillator detectors. Results in the neutron energy range 30 MeV < En < 80 MeV are in good agreement with Monte Carlo simulations of the neutron spectrum.
    Journal of Instrumentation 11/2013; 8(11):1008P-. · 1.53 Impact Factor
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    ABSTRACT: The performance characteristics of the Off Specular MicrOstrip Neutron Detector (OSMOND) are described. Based on microstrip gas chamber (MSGC) detectors, OSMOND is a high counting rate detector, with sub-millimeter position resolution, capable of replacing the existing rate limited scintillator detectors currently in use on the suite of reflectometer instruments of the ISIS spallation neutron source. The detector system is described together with results of neutron beam tests carried out on the CRISP and POLREF reflectometers.
    IEEE Transactions on Nuclear Science 06/2013; 60(3):2232-2236. · 1.46 Impact Factor
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    ABSTRACT: The software package ANTS (Anger-camera type Neutron detector: Toolkit for Simulations), developed for simulation of Anger-type gaseous detectors for thermal neutron imaging was extended to include a module for experimental data processing. Data recorded with a sensor array containing up to 100 photomultiplier tubes (PMT) or silicon photomultipliers (SiPM) in a custom configuration can be loaded and the positions and energies of the events can be reconstructed using the Center-of-Gravity, Maximum Likelihood or Least Squares algorithm. A particular strength of the new module is the ability to reconstruct the light response functions and relative gains of the photomultipliers from flood field illumination data using adaptive algorithms. The performance of the module is demonstrated with simulated data generated in ANTS and experimental data recorded with a 19 PMT neutron detector. The package executables are publicly available at http://coimbra.lip.pt/~andrei/ [http://coimbra.lip.pt/~andrei]
    Journal of Instrumentation 05/2013; 8(05):P05002. · 1.53 Impact Factor
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    ABSTRACT: The development and testing of the SuPerior Rate for INTER (SPRINTER) detector is described. Based on a microstrip gas chamber (MSGC), the aim of the project was to produce a matched pair of high-counting-rate detectors capable of replacing the existing 3He tubes currently used on the INTER reflectometer of the ISIS spallation neutron source. The detector system is described, and the results from the first neutron beam tests carried out on an ISIS neutron reflectometer are also shown.
    IEEE Transactions on Nuclear Science 04/2013; 60(2):1327-1331. · 1.46 Impact Factor
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    ABSTRACT: The development and testing of the Off Specular MicrOstrip Neutron Detector (OSMOND) is described. Based on a microstrip gas chamber the aim of the project was to produce a high counting rate detector capable of replacing the existing rate limited scintillator detectors currently in use on the CRISP reflectometer for off specular reflectometry experiments. The detector system is described together with results of neutron beam tests carried out at the ISIS spallation neutron source.
    Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 01/2013; 698:168–176. · 1.32 Impact Factor
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    ABSTRACT: The existence of resonance peaks in neutron absorption spectra in the epithermal range of energies enables unique non-destructive testing techniques. The deep penetration of epithermal neutrons provides an opportunity to perform a compositional analysis of a sample which is opaque to X-rays and thermal neutrons. The neutron resonances in the transmission spectra constitute a characteristic pattern for many isotopes, which can be used to identify the isotope and to map the distribution of the isotope in a sample. The neutron transmission spectra can be measured with the time of flight (TOF) technique using a pulsed neutron source. Combining this method with a high resolution neutron counting detector enables substantial improvements of spatial resolution of neutron resonance transmission imaging. Such a detector has been developed to register neutrons with 55 μm spatial and 10-1000 ns temporal resolution Our proof-of-principle experiments at the ISIS pulsed neutron spallation source demonstrate that compositional analysis of multi-element samples can now be performed with ~150 μm spatial resolution. Images of a test mask consisting of <; 200 μm thick foils of Au, Ag, In and Gd were collected in the 1-100 eV energy range. The experimental results demonstrate the potential for compositional analysis via resonance absorption transmission with high spatial resolution. In-bulk temperature measurement through Doppler broadening analysis will also benefit from this technique.
    IEEE Transactions on Nuclear Science 12/2012; 59(6):3272-3277. · 1.46 Impact Factor
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    ABSTRACT: The development and testing of the SuPerior Rate for INTER (SPRINTER) detector is described. Based on a Microstrip Gas Chamber (MSGC) the aim of the project was to produce a matched pair of high counting rate detectors capable of replacing the existing 3He tubes currently used on the INTER reflectometer of the ISIS spallation neutron source. The detector system is described and the results from the first neutron beam tests carried out on an ISIS neutron reflectometer are also shown.
    2012 IEEE Nuclear Science Symposium and Medical Imaging Conference (2012 NSS/MIC); 10/2012
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    ABSTRACT: The high-energy neutron field of the VESUVIO instrument at the ISIS facility has been characterized using the technique of thin-film breakdown counters (TFBC). The technique utilizes neutron-induced fission reactions of natU and 209Bi with detection of fission fragments by TFBCs. Experimentally determined count rates of the fragments are ≈50% higher than those calculated using spectral neutron flux simulated with the MCNPX code. This work is a part of the project to develop ChipIr, a new dedicated facility for the accelerated testing of electronic components and systems for neutron-induced single event effects in the new Target Station 2 at ISIS. The TFBC technique has shown to be applicable for on-line monitoring of the neutron flux in the neutron energy range 1–800 MeV at the position of the device under test (DUT).
    Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 09/2012; 687:14–22. · 1.32 Impact Factor
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    ABSTRACT: A fast neutron beam monitor based on a triple Gas Electron Multiplier (GEM) detector was developed and tested for the ISIS spallation neutron source in U.K. The test on beam was performed at the VESUVIO beam line operating at ISIS. The 2D fast neutron beam footprint was recorded in real time with a spatial resolution of a few millimeters thanks to the patterned detector readout.
    Journal of Instrumentation 07/2012; 7(07). · 1.53 Impact Factor
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    ABSTRACT: The prototype of a wavelength-sensitive neutron filter has been realized and tested successfully for the first time. The filter exploits the neutron wavelength dependence of the transparency of He-3 gas. The analysis of test results gives high wavelength resolution Delta lambda/lambda similar or equal to 0.5% over the broad wavelength range 0.2-5.2 angstrom. We propose an idea to expand the filter range in the short wavelength direction by use of a cryogenic environment, and also consider the use of media using other than He-3 gas. The proposed filter might be used in advanced reflectometers and SANS2D neutron scattering instruments.
    Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 06/2012; 677:1 - 3. · 1.32 Impact Factor
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    ABSTRACT: The resonance structure in neutron induced reaction cross sections can be used to determine the elemental compositions of materials or objects. The occurrence of resonances is the basis of neutron resonance capture analysis (NRCA) and neutron resonance transmission analysis (NRTA). NRCA and NRTA are fully non-destructive methods to determine the bulk elemental composition without the need of any sample preparation and resulting in a negligible residual activity. They have been applied to determine the elemental composition of archaeological objects and to characterize reference materials used for cross section measurements. For imaging applications a position sensitive neutron detector has been developed within the ANCIENT CHARM project. The detector is based on a 10 × 10 array of 6Li-glass scintillators mounted on a pitch of 2.5 mm, resulting in a 25 × 25 mm2 active area. The detector has been tested at the time-of-flight facility GELINA and used at the ISIS spallation source to study cultural heritage objects.
    Journal of Instrumentation 03/2012; 7(03). · 1.53 Impact Factor
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    ABSTRACT: A 2D position sensitive gas scintillation detector for thermal neutrons is under development as part of the European FP7 NMI3 JRA program (Project 226507). The aim of the project is to have a detector with: sub-millimetre position resolution, high rate capability (>1 MHz), high efficiency (>50% for 1 Angstrom neutrons) and an active area of 200×200 mm2. A detector with these characteristics is of interest for retlectometry and micro-focusing SANS instruments at the neutron scattering facilities. The detector under development is a gas scintillation proportional counter (GSPC) that uses the light emitted in the gas avalanche to determine the position of neutrons absorbed inside the detector using the Anger camera principle. The device for the gas multiplication is an MSGC and the gas is a mixture of 3He and CF4, Despite the worldwide shortage of 3He, it still represents a valid option for small detectors that require high efficiency like the one under development in this project. The status of the project will be reported in the following sections.
    Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2012 IEEE; 01/2012
  • D.M. Duxbury, N.J. Rhodes, E.M. Schooneveld, E.J. Spill
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    ABSTRACT: The Gaseous Electron Multiplier (GEM) technology promises to deliver 3He based neutron detectors for a wide range of applications for the spallation neutron source ISIS. These devices offer a high rate capability and when used in conjunction CF4 as a quench gas they offer the potential of a sub mm resolution 2D detector for thermal neutron detection. The operation of these devices at elevated CF4 pressures (necessary for reducing the proton range) however has proved to be somewhat challenging. A program of work was undertaken at RAL to determine whether these devices are appropriate for deployment on the ISIS instruments.
    Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2012 IEEE; 01/2012
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    ABSTRACT: A neutron transmission detector has been developed at ISIS for use on the Small Angle Neutron Scattering instrument, SANS2D. The new transmission detector has a negligible effect on the SANS pattern. This means the SANS area detector and the transmission detector can be used simultaneously. The use of this detector has given rise to a more than 30% increase in measurement output during its first period of operation. The unique design could be used at other SANS facilities, where currently the transmission measurement is taken independently of the SANS measurement.
    Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2012 IEEE; 01/2012
  • G.J. Sykora, E.M. Schooneveld, N.J. Rhodes, L. Van Eijck
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    ABSTRACT: Gamma sensitivity of an ISIS linear position sensitive wavelength shifting fiber (WLSF) detector was evaluated at the Reactor Institute Delft (RID) using 60Co and 137CS sources. The caveat of quoting gamma sensitivity of a detector in pure gamma fields is that detectors are never operated in gamma only environments. A concern is that the sensitivity may increase during neutron measurements due to the increase of pulse pile-up which can occur in ZnS:Ag detectors as the afterglow of a neutron event coincides with a gamma scintillation event causing the gamma event to appear brighter than it actually was. For this reason, gamma sensitivity measurements were performed on a time of flight neutron reflectometer at RID. Results presented here detail neutron efficiency and rate capability of the detector as well as demonstrate gamma sensitivity in pure gamma and mixed fields. It is shown that, in a pure gamma field, the detector has gamma sensitivity on the order of 10-7-10-6 for 60Co and 10-9-10-8 for 137Cs as a result of detector geometry, fibre coding and signal processing. Gamma sensitivity is unchanged to any statistical significance in a mixed neutron gamma field. A less than 1% gamma-induced deadtiming at neutron rates above 5kHz and high gamma flux on the order of 104 gammas/second/cm2 was observed.
    Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2012 IEEE; 01/2012
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    ABSTRACT: The global shortage of 3He gas is an issue to be addressed in neutron detection. In the context of the research and development activity related to the replacement of 3He for neutron counting systems, neutron diffraction measurements performed on the INES beam line at the ISIS pulsed spallation neutron source are presented. For these measurements two different neutron counting devices have been used: a 20bar pressure squashed 3He tube and a Yttrium–Aluminum–Perovskite scintillation detector. The scintillation detector was coupled to a cadmium sheet that registers the prompt radiative capture gamma rays generated by the (n,γ) nuclear reactions occurring in cadmium. The assessment of the scintillator based counting system was done by performing a Rietveld refinement analysis on the diffraction pattern from an ancient Japanese blade and comparing the results with those obtained by a 3He tube placed at the same angular position. The results obtained demonstrate the considerable potential of the proposed counting approach based on the radiative capture gamma rays at spallation neutron sources.
    Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 10/2011; 654(1):373-376. · 1.32 Impact Factor
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    ABSTRACT: Here we present a new concept for a time-of-flight neutron scattering instrument allowing for simultaneous application of three different techniques: time-of-flight neutron diffraction, neutron resonance capture analysis and Bragg edge transmission analysis. The instrument can provide average resolution neutron radiography too. The potential of the proposed concept was explored by implementing the necessary equipment on INES (Italian Neutron Experimental Station) at the ISIS spallation neutron source (UK). The results obtained show the effectiveness of the proposed instrument to acquire relevant quantitative information in a non-invasive way on a historical metallurgical sample, namely a Japanese hand guard (tsuba). The aforementioned neutron techniques simultaneously exploited the extended neutron energy range available from 10 meV to 1 keV. This allowed a fully satisfactory characterization of the sample in terms of metal components and their combination in different phases, and forging and assembling methods.
    EPL (Europhysics Letters) 08/2011; 95(4):48007. · 2.27 Impact Factor

Publication Stats

362 Citations
86.47 Total Impact Points

Institutions

  • 2010–2013
    • Science and Technology Facilities Council
      Swindon, England, United Kingdom
  • 2004
    • University of Milan
      • Department of Physics
      Milano, Lombardy, Italy
    • University of Rome Tor Vergata
      • Dipartimento di Fisica
      Roma, Latium, Italy
  • 2003–2004
    • University of Aveiro
      • Department of Physics
      Aveiro, Aveiro, Portugal