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TEM investigation of 14 MeV neutron damage

Description: From joint meeting of the American Nuclear Society and the Atomic Industrial Forum and Nuclear Energy Exhibition; San Francisco, California, USA (11 Nov 1973). 14-MeV neutron damage has been investigated in gold by means of transmission electron microscopy (TEM). The sites of energetic displacement cascades are visible due to the presence of vacancy clusters formed by the collapse or rearrangement of vacancies within the depleted zones. In 14-MeV n- induced cascades, a strong tendency towards s… more
Date: November 1, 1973
Creator: Merkle, K. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Proof-of-Concept Assessment of a Photofission-Based Interrogation System for the Detection of Shielded Nuclear Material

Description: A photonuclear interrogation method was experimentally assessed for the detection of shielded nuclear materials. Proof-of-Concept assessment was performed at the Los Alamos National Laboratory (LANL) TA-18 facility and used the INEEL VARITRON electron accelerator. Experiments were performed to assess and characterize the delayed neutron emission responses for different nuclear materials with various shield configurations using three ''nominal'' electron beam energies; 8-, 10-, and 11-MeV. With … more
Date: November 1, 2000
Creator: Jones, J. L.; Yoon, W. Y.; Harker, Y. D.; Hoggan, J. M.; Haskell, K. J. & VanAusdeln, L. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Phonon dispersion relation of uranium nitrate above and below the Neel temperature

Description: Neutron coherent inelastic scattering measurements have been made of the phonon dispersion relation of uranium nitride both above and below the Neel temperature T/sub N/ = 50 K. Within the precision of the measurements, about 1% in frequency and 10% in line width and in scattered neutron intensity, no significant changes in these phonon properties were observed as a function of temperature other than those arising from population factor changes and a small stiffening of the lattice as the tempe… more
Date: January 1, 1977
Creator: Dolling, G; Holden, T M; Evensson, E C; Buyers, W J.L. & Lander, G H
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Partner: UNT Libraries Government Documents Department
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Cancer risks and neutron RBE's from Hiroshima and Nagasaki

Description: The new radiation dose estimates for Hiroshima and Nagasaki are here combined with epidemiologic data from the A-bomb survivors and examined radiobiologically for compatability with other human and experimental data. The new doses show certain improvements over the original T65 doses. However, they suggest for chronic granulocytic leukemia, total malignancies, and chromosome aberrations, at neutron doses of 1 rad, RBEs in excess of 100, higher than expected from other findings. This and other i… more
Date: April 30, 1982
Creator: Dobson, R.L. & Straume, T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Local energy transfer to TLDS by neutrons and photons

Description: The local energy transferred from neutrons and photons to TLD materials with respect to energy transferred to biological tissues or air has been calculated. Experimental response of TLDs was measured for photons with energies above 1.5 keV.
Date: March 3, 1980
Creator: Singh, M. S.; Gaines, J. L. & Parlagreco, J. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Personnel neutron dosimetry applications of track-size distributions on electrochemically etched CR-39 foils

Description: The track-size distribution on electrochemically etched CR-39 foils can be used to obtain some limited information on the incident neutron spectra. Track-size distributions on CR-39 foils can also be used to determine if the tracks were caused by neutrons or if they are merely background tracks (which have a significantly different track-size distribution). Identifying and discarding the high-background foils reduces the number of foils that must be etched. This also lowers the detection limit … more
Date: September 1, 1988
Creator: Hankins, D.E.; Homann, S.G. & Westermark, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Matter-antimatter oscillations and neutrino mass

Description: A discussion of neutron-antineutron (n- anti n) and hydrogen-antihydrogen (H- anti H) transitions is presented. An SU(2)/sub L/ x U(1) x SU(3)/sub c/ model with spontaneously broken global B-L symmetry is shown to predict the interesting connection between oscillation times T/sub n- anti n/, T/sub H- anti H/, neutrino mass and the mass of a doubly charged Higgs scalar. A case of B-L as a gauge symmetry is discussed in the context of SU(2)/sub L/ x SU(2)/sub R/ x U(1)/sub B-L/ x SU(3)/sub c/ gau… more
Date: January 1, 1982
Creator: Senjanovic, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Detection of radiation-induced changes in electrochemical properties of austenitic stainless steels using miniaturized specimens and the single-loop electrochemical potentiokinetic reactivation method

Description: Single-loop electrochemical potentiokinetic reactivation testing of miniaturized (TEM) specimens can provide reliable data comparable to data obtained with larger specimens. Significant changes in electrochemical properties (increased reactivation current and Flade potential) were detected for PCA and type 316 stainless steels irradiated at 200--420[degrees]C up to 7--9 dpa. Irradiations in the FFTF Materials Open Test Assembly and in the Oak Ridge Research Reactor are reported on. 45 figs., 5 … more
Date: January 1, 1993
Creator: Inazumi, T.; Bell, G.E.C.; Kenik, E.A. & Kiuchi, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Phenomenology of CP violation from the Kobayashi-Maskawa model

Description: The CP violation consequences of the K-M model, which Kobayashi, Maskawa introduced in 1977 for the purpose of incorporating CP violation via the complexity in the mixing matrix of the quarks are discussed. Much of the talk is a review of current work on the subject. Some new results on the CP violation effects in exclusive and inclusive decays of bottom, charm and strange particles are also given.
Date: January 1, 1980
Creator: Wang, L. L. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Mixed radiation field dosimetry utilizing Nuclear Quadrupole Resonance. Technical progress report

Description: This project has proposed to develop a novel dosimetry system that is capable of directly evaluating the chemical/biological damage caused by neutrons, photons, or both in a single measurement. The dosimeter itself will consist of a small volume of biological equivalent material that is probed for radiation damage with Nuclear Quadrupole Resonance (NQR) techniques. NQR has previously been utilized as a sensitive probe of structural and chemical changes at the molecular level for a variety of or… more
Date: December 31, 1991
Creator: Hintenlang, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Nuclear structure studies via neutron interactions. Progress report, 1 July 1992--30 June 1993

Description: Comparison has been made between the empirical integrated strengths and external R-functions and the predictions of a dispersive optical model for the n-{sup 208}Pb system, for partial waves through f{sub 7/2}. Parameters of a constant geometry model give a fair representation of the experimental results. A hint of the need for a parity dependence in one of the model parameters is seen in the two data and in thetotal cross section in the low-energy region. Other research performed consisted of:… more
Date: March 1, 1993
Creator: Carlton, R. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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AGR-1 Irradiated Test Train Preliminary Inspection and Disassembly First Look

Description: The AGR-1 irradiation experiment ended on November 6, 2009, after 620 effective full power days in the Advanced Test Reactor, achieving a peak burnup of 19.6% FIMA. The test train was shipped to the Materials and Fuels Complex in March 2010 for post-irradiation examination. The first PIE activities included non-destructive examination of the test train, followed by disassembly of the test train and individual capsules and detailed inspection of the capsule contents, including the fuel compacts … more
Date: January 1, 2011
Creator: Demkowicz, Paul; Cole, Lance; Ploger, Scott; Winston, Philip; Pham, Binh & Abbott, Michael
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Investigations into the thermal defect of tissue-equivalent plastic. [A-150]

Description: The thermal defect, defined as the fraction of absorbed radiation energy which is not converted to heat energy in the calorimetric dosimetry absorber was investigated for A-150 tissue-equivalent plastic. Studies to measure the thermal defect as a function of proton energy and for various energies of alpha particles and the heavy recoil nuclei produced in tissue by neutrons are proposed along with a proposal to compare the thermal defects of A-150 plastic obtained from different laboratories and… more
Date: January 1, 1976
Creator: Goodman, L. J. & McDonald, J. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A Second Look at Neutron Resonance Transmission Analysis as a Spent Fuel NDA Technique

Description: Many different nondestructive analysis techniques are currently being investigated as a part of the United States Department of Energy's Next Generation Safeguards Initiative (NGSI) seeking methods to quantify plutonium in spent fuel. Neutron Resonance Transmission Analysis (NRTA) is one of these techniques. Having first been explored in the mid-1970s for the analysis of individual spent-fuel pins a second look, using advanced simulation and modeling methods, is now underway to investigate the … more
Date: July 1, 2011
Creator: Sterbentz, James W. & Chichester, David L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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