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Showing 1 to 20 of 41 for “"Neutron Irradiation"”.
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Neutron irradiation effects in gallium arsenide
… electrical properties of n-GaAs as a result of irradiations with fast neutrons have been studied, after epitaxial layers doped with Si at concentrations in the range 1.35 $\times$ 10$\sp{15}$ to 1.60 $\times$ 10$\sp{16}$ cm$\sp{-3}$ were irradiated with reactor neutron fluences up to 1.31 …
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Radiocarbon Compounds Produced by Slow Neutron Irradiation of Ammonium-Chloride and Ammonium-Bromide
Made available in DSpace on 2014-12-05T19:36:00Z (GMT). No. of bitstreams: 1 0009159.pdf: 9416785 bytes, checksum: 0d9bd00afb24b88d20acff44e286f72a (MD5) Previous issue date: 1954
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Design and construction of a fast neutron irradiation facility for use at elevated temperature
Typescript (photocopy).
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Design and construction of a fast neutron irradiation facility for use at elevated temperature
Typescript (photocopy).
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Production methods of radiation sensitive ultrasound contrast agents and their response to neutron irradiation
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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4H silicon carbide particle detectors: study of the defects induced by high energy neutron irradiation
… work it was analyzed the effect of high energy neutron irradiation on 4H-SiC particle detectors. Schottky and junction particle detectors were irradiated with 1 MeV neutrons up to fluence of 1016 cm-2. It is well known that the degradation of the detectors with irradiation, independently of the …
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The effect of neutron irradiation on the density of low-energy excitations in vitreous silica
… These measurements were repeated after fast neutron irradiation of the material. It was found that the irradiation produced changes of the same relative magnitude in the low-temperature excess specific heat C , the thermal conductivity K, ex and the anomalous temperature dependence of the …
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Investigation of the effects of pressure and hydrogen concentration on ammonia synthesis under neutron irradiation
… on the formation of ammonia by slow neutron irradiation of gaseous hydrogen-nitrogen systems. A secondary purpose of this investigation was to determine the effects of neutron irradiation on ammonia synthesis. Apparatus consisted of two parallel reaction tubes identical except that …
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Impact of cellular dislocation structures produced by additive manufacturing on neutron irradiation damage evolution in stainless steel 316L
… features and their potential impact on irradiation-induced damage mechanisms must be studied. Stainless steel 316L (SS-316L) samples were irradiated in the Advanced Test Reactor overa range of fast neutron fluences as part of a grant received by the Colorado School of Mines. …
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Magnetic analysis of nuclear pressure vessel steels and other ferromagnetic materials subject to neutron irradiation and heat treatment
Mechanical and magnetic property changes due to neutron irradiation and heat treatment were investigated for the sake of developing a nondestructive method of monitoring nuclear pressure vessel steel embrittlement during reactor operation. Four kinds of samples, including pressure vessel steel, …
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Characterization of the Neutron Irradiation System for use in the Low-Dose-Rate Irradiation Facility at Sandia National Laboratories
… objective of this work was to characterize the neutron irradiation system consisting of americium 241 beryllium (241AmBe) neutron sources placed in a polyethylene shielding for use at Sandia National Laboratories (SNL) Low Dose Rate Irradiation Facility (LDRIF). With a total activity of 0.3 TBq …
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The development and evaluation of 252Cf neutron irradiation facilities for two biomedical applications using discrete ordinates, Monte Carlo, and experimental methods.
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Nuclear Engineering, 1977
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Experimental approaches for the production of thorium-229
… of production we chose to investigate are 1) the irradiation of a 226Ra target in the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory (ORNL) and 2) the fast neutron irradiation of a 230Th target in a particle accelerator. This thesis outlines several experiments completed at ORNL …
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Spectroscopic and Electrical Characterization of SiO<sub>x</sub> and GaN Device Structures as a Function of Irradiation
Detecting irradiation and protecting complementary-metal-oxide-semiconductor (CMOS) devices from harsh radiation environments is vital for electronics in space and national security. For CMOS devices, ionizing photons have enough energy to break bonds within SiO<sub>2</sub> causing electrons, …
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Irradiation induced damage in CANDU spacer material Inconel X-750
… application in commercial reactors, accelerated irradiation tests had been conducted in liquid metal fast reactors. Results did not indicate any problem stemming from significant fast neutron irradiation. However, recently it has been found that the ex-service CANDU Inconel X-750 spacers became …
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Tritium thermal desorption testing of nuclear graphites irradiated at fluoride-salt-cooled high-temperature reactor conditions
… the release of tritium generated from neutron irradiation of flibe below acceptable levels. One proposed method for partitioning tritium from the salt is through adsorption onto graphite. Demonstrating the viability of this type of tritium control system requires further experimental …
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Carbon Nanotube Based Dosimetry of Neutron and Gamma Radiation
… another 20 years, accurate information regarding neutron radiation exposure is more important than ever. Structural components such as the reactor pressure vessel (RPV) become embrittled by neutron irradiation, reducing their capability to resist crack growth and increasing the risk of …
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Noble gases anomalies in terrestrial ores and meteorites
… with geologic age estimates. Application of the neutron irradiation method of ¹²⁹I-¹²⁹Xe dating to chondrules and matrix of Bjurböle meteorite reveal the following: 1. The ¹²⁹I/¹²⁷ ratios incorporated in the Bjurböle chondrules and matrix are identical thereby indicating that these fractions are …
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Role of impurities, LiF, and processing on the sintering, microstructure, and optical properties of transparent polycrystalline magnesium aluminate (MgAl2O4) spinel, The
… processing variables, and for the first time of neutron irradiation of starting powders, on the sintering behavior of cold-pressed powder compacts. Green-body density, stoichiometry, and impurities had the greatest effect on densification, whereas powder neutron irradiation and reducing …
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