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Languages : en
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Response of a New Pad-based Neutron Detector Developed for Coded Aperture Thermal Neutron Imaging
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Category :
Languages : en
Pages :
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Category :
Languages : en
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A New Pad-Based Neutron Detector for Stereo Coded Aperture Thermal Neutron Imaging
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Languages : en
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Languages : en
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רבי ועלוול
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Category :
Languages : en
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Category :
Languages : en
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Adaptation of a Neutron Diffraction Detector to Coded Aperture Imaging
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Category :
Languages : en
Pages : 4
Book Description
A coded aperture neutron imaging system developed at Brookhaven National Laboratory (BNL) has demonstrated that it is possible to record not only a flux of thermal neutrons at some position, but also the directions from whence they came. This realization of an idea which defied the conventional wisdom has provided a device which has never before been available to the nuclear physics community. A number of potential applications have been explored, including (1) counting warheads on a bus or in a storage area, (2) investigating inhomogeneities in drums of Pu-containing waste to facilitate non-destructive assays, (3) monitoring of vaults containing accountable materials, (4) detection of buried land mines, and (5) locating solid deposits of nuclear material held up in gaseous diffusion plants.
Publisher:
ISBN:
Category :
Languages : en
Pages : 4
Book Description
A coded aperture neutron imaging system developed at Brookhaven National Laboratory (BNL) has demonstrated that it is possible to record not only a flux of thermal neutrons at some position, but also the directions from whence they came. This realization of an idea which defied the conventional wisdom has provided a device which has never before been available to the nuclear physics community. A number of potential applications have been explored, including (1) counting warheads on a bus or in a storage area, (2) investigating inhomogeneities in drums of Pu-containing waste to facilitate non-destructive assays, (3) monitoring of vaults containing accountable materials, (4) detection of buried land mines, and (5) locating solid deposits of nuclear material held up in gaseous diffusion plants.
Development of a Solid State Neutron Detector for SNAP 10A
Author: A. Chesavage
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Category : Neutron counters
Languages : en
Pages : 46
Book Description
Publisher:
ISBN:
Category : Neutron counters
Languages : en
Pages : 46
Book Description
Active Coded Aperture Neutron Imaging
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Category :
Languages : en
Pages : 13
Book Description
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Category :
Languages : en
Pages : 13
Book Description
Stereoscopic System of Coded Aperture Neutron Pad Cameras for Warhead Counting
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Languages : en
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Progress report presented at the RadSensing 2012 meeting, Albuquerque, New Mexico.
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Languages : en
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Progress report presented at the RadSensing 2012 meeting, Albuquerque, New Mexico.
Calibration and Simulation of a Coded Aperture Neutron Imaging System
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Category :
Languages : en
Pages : 12
Book Description
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Category :
Languages : en
Pages : 12
Book Description
Coded Aperture Imaging Using Neutrons
Author: Paul James Rose
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Category : Imaging systems
Languages : en
Pages : 208
Book Description
Publisher:
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Category : Imaging systems
Languages : en
Pages : 208
Book Description
Characterizing the Detector Response and Testing the Performance of a New Well Counter for Neutron Coincidence Measurements of Plutonium in Residues
Author:
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Category :
Languages : en
Pages : 8
Book Description
A thermal neutron detector has been developed that integrates the neutron capture medium (6LiF) and scintillator (ZnS) into a thin screen, which is coupled to wavelength shifting fiber-optic ribbon. The 6LiF and ZnS powders are incorporated in a hydrogenous binder. The detector is constructed of alternating layers of the capture/scintillator screen and the fiber-optic ribbon. The scintillation light produced in the ZnS is absorbed and reemitted in the fibers and is transported to photomultiplier tubes (PMTs). The detector is sensitive to gamrna radiation, but the difference in the pulse decay times of gamma-ray and neutron events allows for discrimination using pulse shape analysis (PSA). To determine the feasibility of using PSA with this detector, a number of intrinsic characteristics of the detector have been measured; specifically, the number of photoelectrons produced at the photocathode of the PMT from the average neutron capture event in the screen and the temperature stability of the detector with respect to pulse shape. The number of photons that reach the PMTs was measured with two different PMTs. One was a typical PMT with single-photoelectron resolution, and the other was a Hybrid PMT comprised of a photocathode coupled to a PIN diode with few-photoelectron resolution. The number of photons that reach the PMTs is between 1600 and 2200, which is sufficient for PSA. The sensitivity of pulse shape to temperature has also been evaluated. Although the pulse decay time changes with varying temperature between -25 to +50 C, the normalized detector pulses have approximately the same amplitude around 400 ns. This results in a stable zero-crossing time of the 400-ns delay-line shaped pulse, and thus the PSA is independent of temperature. A four-sided prototype well counter has been built, It has a short neutron die-away time ([tau]
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
Book Description
A thermal neutron detector has been developed that integrates the neutron capture medium (6LiF) and scintillator (ZnS) into a thin screen, which is coupled to wavelength shifting fiber-optic ribbon. The 6LiF and ZnS powders are incorporated in a hydrogenous binder. The detector is constructed of alternating layers of the capture/scintillator screen and the fiber-optic ribbon. The scintillation light produced in the ZnS is absorbed and reemitted in the fibers and is transported to photomultiplier tubes (PMTs). The detector is sensitive to gamrna radiation, but the difference in the pulse decay times of gamma-ray and neutron events allows for discrimination using pulse shape analysis (PSA). To determine the feasibility of using PSA with this detector, a number of intrinsic characteristics of the detector have been measured; specifically, the number of photoelectrons produced at the photocathode of the PMT from the average neutron capture event in the screen and the temperature stability of the detector with respect to pulse shape. The number of photons that reach the PMTs was measured with two different PMTs. One was a typical PMT with single-photoelectron resolution, and the other was a Hybrid PMT comprised of a photocathode coupled to a PIN diode with few-photoelectron resolution. The number of photons that reach the PMTs is between 1600 and 2200, which is sufficient for PSA. The sensitivity of pulse shape to temperature has also been evaluated. Although the pulse decay time changes with varying temperature between -25 to +50 C, the normalized detector pulses have approximately the same amplitude around 400 ns. This results in a stable zero-crossing time of the 400-ns delay-line shaped pulse, and thus the PSA is independent of temperature. A four-sided prototype well counter has been built, It has a short neutron die-away time ([tau]