Neutron spectrometry with He-3 proportional counters

Manolopoulou, M.; Fragopoulou, M.; Stoulos, S.; Vagena, E.; Westmeier, W.; Zamani, M.

doi:10.1109/animma.2011.6172851

Cited by 2 publications

(3 citation statements)

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“…Helium-3 is used as a means in fast neutron spectroscopy [58][59][60], whereas Helium-4 is employed for fast neutron detection [58,[61][62][63][64][65]. Due to its cross section (shown in Fig.…”

Section: Theoretical Considerationsmentioning

confidence: 99%

“…where A is the mass number of the isotope. Helium-3 detectors are used in fast neutron spectroscopy measurements [58][59][60], because in the case of a mono-energetic fast neutron beam, the incoming neutrons energy can be deduced. Let us consider an ideal detector case, where the wall effect can be neglected, and a beam of mono-energetic E i incoming neutrons.…”

Section: Theoretical Considerationsmentioning

confidence: 99%

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Verification of He-3 proportional counters’ fast neutron sensitivity through a comparison with He-4 detectors

et al. 2020

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In the field of neutron scattering science, a large variety of instruments require detectors for thermal and cold neutrons. Helium-3 has been one of the main actors in thermal and cold neutron detection for many years. Nowadays, neutron facilities around the world are pushing their technologies to increase the available flux delivered at the instruments; this enables a completely new science landscape. Complementary with the increasing available flux, a better signal-to-background (S/B) ratio enables to perform new types of measurements. For instance, in neutron reflectometry, the time resolution for kinetic studies is limited by the available S/B. An improved S/B opens the possibility of sub-second kinetic studies. To this aim, this manuscript reexamines the background sensitivity of today's "gold standard" neutron detection. Fast neutrons and gamma rays are the main background species in neutron scattering experiments. The efficiency (sensitivity) of detecting fast neutrons, cosmic rays and gamma rays, for a Helium-3-based detector is studied here through the comparison with Helium-4 counters. The comparison with Helium-4 allows to separate the thermal (and cold) neutron from the fast neutron contributions in Helium-3-based counters which are otherwise entangled, verifying previous results from an indirect method. A relatively high sensitivity is found. Moreover, an estimate for the cosmic neutron fluence, also a source of background, at ground level at ESS is presented in this manuscript.

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Section: Theoretical Considerationsmentioning

confidence: 99%

Section: Theoretical Considerationsmentioning

confidence: 99%

Verification of He-3 proportional counters’ fast neutron sensitivity through a comparison with He-4 detectors

et al. 2020

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“…Also, low energy neutrons create pile-up which obscures details in the fast neutron spectrum (26) . Bubble Technology Industries (BTI) resolved these problems assigning three energy bins in the unfolded spectrum: thermal to 10 keV, 10 keV to 500 keV, and 500 keV to 1 MeV.…”

Section: Neutron Interactionsmentioning

confidence: 99%

Characterization of the neutron irradiation system for use in the Low-Dose-Rate Irradiation Facility at Sandia National Laboratories.

Friedrich

2014

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I would like to acknowledge the following individuals because without them this would not be possible. Christina B. Hanson (RSPD) made it known to me that this work needed to be completed, and she guided me to the right people. Truly without her this would have never happened. Dr. Maryla Wasiolek (GIF/Research Advisor) supervised the project, and she provided technical guidance. Dr. Gary Cooper (Graduate advisor) provided guidance, and he agreed to be my graduate advisor. Don Hanson (GIF) moved, configured, and assisted in positioning of the equipment and experiment. Dr. Dann Ward (RP) gave technical advice on the N-Probe Microspec and the neutron Bubble Dosimeter Spectroscopy Set. Albert Bendure (RPSD Manager) and Mike Spoerner (TAV Non-Reactor Nuclear Facilities Manager) gave me permission to work on this project. The radiography group (Kyle Thomspon and Kevin Rolfe) performed the radiography experiment. David Vehar (TAV) provided technical advice on the foil activation. I would like to thank Radiation Protection Sample Diagnostics for allowing me to irradiate their germanium detector. I would like to thank everyone from Radiation Protection for assisting me. There are many others that I would like to thank for their contribution and assistance in completing this work. Thank you all.

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Neutron spectrometry with He-3 proportional counters

Cited by 2 publications

References 15 publications

Verification of He-3 proportional counters’ fast neutron sensitivity through a comparison with He-4 detectors

Verification of He-3 proportional counters’ fast neutron sensitivity through a comparison with He-4 detectors

Characterization of the neutron irradiation system for use in the Low-Dose-Rate Irradiation Facility at Sandia National Laboratories.

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