High Rfsolution Fast Neutron Spectrometry without Time-of-Flight

Evans, A.E.; Brandenberger, J.D.

doi:10.1109/tns.1979.4330418

Cited by 11 publications

(17 citation statements)

References 3 publications

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“…Strong reliance was also placed on 10 prior reports by Sailor and Prussin, Evans and Brandenberger, and Fisher et al, which provide an excellent overview 11 of the layout and operating principles of the FNS-100 detector. [4,10,19] An Ortec Model 456 power supply was 12 used to bias the detector. 13 14…”

Section: Attenuating Materialsmentioning

confidence: 99%

Fast-neutron spectrometry using a 3He ionization chamber and digital pulse shape analysis

Chichester

Johnson

Seabury

2012

Applied Radiation and Isotopes

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7Digital pulse shape analysis (dPSA) has been used with a Cuttler-Shalev type 3 He ionization chamber to 8 measure the fast-neutron spectra of a deuterium-deuterium electronic neutron generator, a bare 252 Cf spontaneous 9 fission neutron source, and of the transmitted fast neutron spectra of a 252 Cf source attenuated by water, graphite, 10 liquid nitrogen, and magnesium. Rise-time dPSA has been employed using the common approach for analyzing 11 n + 3 He ĺ 1 H + 3 H ionization events and improved to account for wall-effect and pile-up events, increasing the 12 fidelity of these measurements. Simulations have been performed of the different experimental arrangements and 13 compared with the measurements, demonstrating general agreement between the dPSA-processed fast-neutron 14 spectra and predictions. The fast neutron resonance features of the attenuation cross sections of the attenuating 15 materials are clearly visible within the resolution limits of the electronics used for the measurements, and the 16 potential applications of high-resolution fast-neutron spectrometry for nuclear nonproliferation and safeguards 17 measurements are discussed. 18 19

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Section: Attenuating Materialsmentioning

confidence: 99%

Fast-neutron spectrometry using a 3He ionization chamber and digital pulse shape analysis

Chichester

Johnson

Seabury

2012

Applied Radiation and Isotopes

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“…The detector is functionally equivalent to the FNS-100 previously manufactured by Seforad-Applied Radiation Ltd. (Emek Hayaeden, Israel), a gridded ionization chamber that was used in much of the literature cited above. The detector has been extensively described in the literature including prior reports by Sailor and Prussin, Evans and Brandenberger, and Fisher et al [6,12,13] The detector's sensitive length was 0.015 m, its sensitive diameter was 0.0047 m. An Ortec Model 456 power supply was used to bias the detector. The absolute efficiency for C-S type spectrometers, without pulse shape discrimination, has been reported to be (1.7 ± 0.5) u 10 -4 at 2.45 MeV.…”

Section: The Detectormentioning

confidence: 99%

“…These detectors are very sensitive to microphonic noise and electromagnetic interferences but under ideal conditions neutron energy measurements have been made with a resolution of <15 keV, which is the limiting factor for the low-energy range of spectrometry for these detectors. The energy resolution of these detectors degrades at higher energies; a good study of the relationship between neutron energy and resolution for C-S spectrometers is provided in the work of Ohm et al and Owen et al [9,10] The C-S spectrometer energy resolution performance has been reported several times in the literature by several groups and includes observations of E n = thermal (FWHM = 0.013 MeV) [11], E n = thermal (FWHM = 0.013 MeV) [12], E n = 1 MeV (FWHM = 0.025 MeV) [11], E n = 1 MeV (FWHM = 0.027 MeV) [10], E n = 1 MeV (FWHM = 0.029 MeV) [12], E n = 1.27 MeV (FWHM = 0.065 MeV) [4], and E n = 2.450 MeV (FWHM = 0.046 MeV) [13].…”

Section: Introductionmentioning

confidence: 99%

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Measurement Of The Neutron Spectrum Of A DD Electronic Neutron Generator

Chichester¹,

Johnson²,

Seabury³

2011

AIP Conference Proceedings

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Abstract.A Cuttler-Shalev (C-S) 3 He proportional counter has been used to measure the energy spectrum of neutrons from a portable deuterium-deuterium electronic neutron generator. To improve the analysis of results from the C-S detector digital pulse shape analysis techniques have been used to eliminate neutron recoil artifacts in the recorded data. Data was collected using a 8-GHz, 10-bit waveform digitizer with its full scale corresponding to approximately 6-MeV neutrons. The measurements were made with the detector axis perpendicular to the direction of ions in the ENG in a plane 0.5-m to the side of the ENG, measuring neutrons emitted at an angle from 87.3q to 92.7q with respect to the path of ions in the ENG. The system demonstrated an energy resolution of approximately 0.040 MeV for the thermal peak and approximately 0.13 MeV at the DD neutron energy. In order to achieve the ultimate resolution capable with this type of detector it is clear that a higher-precision digitizer will be needed.

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“…The effect the type of discharge and gamma ray level will be discussed further below. The manufacturer and various authors [2,22,24,26] have indicated that the maximum count rate is 104 counts per second. However, it is the electronic pulse system which limits the count rate.…”

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confidence: 99%

A fast neutron spectrometer for D-D fusion neutron measurements at the Alcator C tokamak

Fisher

Chen

Gwinn

et al. 1984

Nuclear Instruments and Methods in Physics Research

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A neutron spectrometer using a high pressure 3 He ionization chamber has been designed and used to measure the neutron spectrum from an ohmically heated deuterium plasma. The resolution of the spectrometer at 2.45 MeV is determine to be 46 keV full width at the half maximum (FWHM). Particular attention has been paid to optimizing the detector shielding and collimation to reject thermal and epithermal neutrons scattered from the tokamak structure. As a result, measurements indicate that the ratio of the number of counts in the 2.45 MeV peak to the total number of detected neutron events is 1/67.For the 8 Psec amplifier time constant used, a count rate as high as 44 counts per second has been achieved in the thermonuclear peak.The observed spectra have been compared with calculated spectra using the MCNP Monte Carlo Neutral Particle Transport code and they show good agreement. There is little evidence of neutrons produced from photoneutron reactions or electrodisintegration. It has been possible to confirm that the shape of the thermonuclear peak is consistent with the Gaussian shape predicted and that the ion temperature as determined from the line width is consistent with other Alcator C ion temperature diagnostics, and follows the trends predicted by the theory of Doppler line broadening.

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High Rfsolution Fast Neutron Spectrometry without Time-of-Flight

Cited by 11 publications

References 3 publications

Fast-neutron spectrometry using a 3He ionization chamber and digital pulse shape analysis

Fast-neutron spectrometry using a 3He ionization chamber and digital pulse shape analysis

Measurement Of The Neutron Spectrum Of A DD Electronic Neutron Generator

A fast neutron spectrometer for D-D fusion neutron measurements at the Alcator C tokamak

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