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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 39 for “"Fast neutrons"”.
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Dielectric liquid ionization chambers for detecting fast neutrons
… filled with dielectric liquids for detection of fast neutrons. The three dielectric liquids studied were Tetramethylsilane (TMS), Tetramethylpentane (TMP), and Isooctane, which each have intrinsic properties that make them attractive for fast neutron detection. Their electronic properties are …
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Elastic and inelastic scattering of fast neutrons in fusion reactor materials
… for elastic and. inelastic scattering of fast neutrons in fusion .reactor materials have been studied. Lithium and lead material are likely to be common components of fusion reactor wall configuration design. The measurements were performed using an associated particle time-of- flight …
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The interaction of fast neutrons with shielding and fusion blanket materials
… lead and steel slabs bombarded with 14.1 MeV neutrons were measured to test nuclear data and calculational methods for D - T fusion reactor neutronics. The neutron spectra measured were performed by an organic scintillator using a pulse shape discrimination technique based on a charge …
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Sensitive cross section of a bacterium, Escherichia coli, to fast neutrons
… bacterium, <u>Escherichia coli</u>, to fast (14Mev.) neutrons. The neutrons were obtained from the H³(d,n)He⁴ reaction produced in the Cockeroft-Walton accelerator at Virginia Polytechnic Institute. The reaction provides a neutron source which is almost monoenergetic, symmetrical, has a …
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A Study of the Elastic Scattering of Fast Neutrons by Potassium and lithium
The elastic scattering of fast neutrons by 39K and 7Li has been studied at an incident neutron energy of 14.1 MeV, using a neutron spectrometer employing the associated particle time of flight technique. The source neutrons were produced by the 3H(d,n) 4He reaction at an incident deuteron energy of …
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The scattering of fast neutrons by lead. Construction of an ion source and accelerating tube
Many new ideas have been tried in the search of ion sources with greater output. One of the best announced in recent years is an ion source designed by A. T. Finkelstein and described in the "Review of Scientific Instruments". One of the purposes of the work discussed in this paper was the adaption …
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Monte Carlo simulation of the radiolysis of water by fast neutrons at elevated temperatures up to 350°C
… of neutral liquid water by mono-energetic 2-MeV neutrons and the mechanisms involved at temperatures between 25 and 350 °C. In this work, we chose 2-MeV neutron as our energy of interest since it is known as representative of a fast neutron flux in a nuclear reactor. For light water, for that …
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Moderation of high-energy fast neutrons in beryllium from a tokamak fusion reactor and heat transfer to the cooling water system
… of the moderation of 14.1 MeV primary neutrons in beryllium emitted from a D-T fusion nuclear reaction. The energy deposited from neutron-beryllium interactions which produces heat in the blanket of a fusion tokamak. A review of literature and data available for neutron-beryllium …
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Monte Carlo simulation and experimental studies of the production of neutron-rich medical isotopes using a particle accelerator.
… during the production of proton-rich isotopes, fast and intermediately fast neutrons from nuclear reactions such as (p,xn) are also produced as a by-product in the nuclear reactions. This observation suggests that it is perhaps possible to use these neutrons to activate secondary targets for the …
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Evaluation of fast neutron shielding effectiveness in light-element compounds
Fast neutron shielding has important applications in accelerator facilities, reactor technology, space radiation protection programs, and in minimizing the dose in radiation facilities. Due to their ability to reduce neutron energy and their high absorption cross sections, lightweight and low …
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Computer simulation of neutron capture therapy.
… dose distributions in tissue produced by fast neutrons and by neutron capture reaction products such as gamma rays, C -particles, protons, and heavy particles. These techniques are applied to optimize the effectiveness of the M.I.T. Reactor Medical Therapy Facility through a survey of the …
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A Monte Carlo analysis of neutron thermalization in graphite
… at 1, 2, 5, and 10 microseconds after a burst of fast neutrons. The neutrons were “tracked" to thermal and the Fermi Age and slowing down time were determined.
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Alpha decay of excited states of carbon-12
… anthracene, has been bombarded by monoenergetic fast neutrons. Alpha-particle decays of carbon nuclei have been separated from other events by a specialised application of the pulse shape discrimination technique. A numerical analysis of the data has yielded alpha-particle energy spectra over a …
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Spectroscopic radiography with monoenergetic neutrons for homeland security applications
… system which uses the spectral analysis of fast neutrons generated in the 11B(d,n[gamma])12C reaction. Neutron radiography in current use systems employs a total count analysis to reconstruct hydrogenous content in scanned cargoes. This research presents a technique which leverages the large …
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Simultaneous fast and slow neutron detection with superheated droplet detector and real-time readout system
… in this research for simultaneous detection of fast neutrons and slow neutrons. The detection system is composed of two SDDs and an imaging-readout system. One of the SDDs is doped with 3.4\% $^6$LiCl, and the other one is a regular SDD. In the imaging-readout system of the detection system, …
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A fast neutron spectrometer
A fast neutron spectrometer was designed and constructed using a proton-recoil telescope. Recoil protons from a thin foil of polyethylene were detected with a silicon surface-barrier diode. The output pulse from the detector is proportional to the energy of the protons and hence the energy of the …
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Pulsed neutron measurements of the diffusion parameters of heavy and light water mixtures at several temperatures
… pulsed Cockcroft-Walton accelerator, using neutrons from the ₁H²(d,n)₂He³ reaction, was used to generate fast neutrons bursts. The values of the infinite medium decay constant, λ₀, were computed by a least squares fit of λ versus B² data to the expression: λ = λ + D₀B² - CB⁴ The parameters …
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Cosmic-ray neutron sensing for soil moisture measurements in cropped fields
… use of the detection of natural background of fast neutrons, the so-called cosmic-ray neutron sensing (CRS) approach to measure field-scale soil moisture in cropped fields. Primary cosmic rays penetrate the top atmosphere and interact with atmospheric particles. Such interaction results on a …
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