Download or read book Defect Formation in 800 MeV Proton irradiated Aluminum written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Transmission electron microscopy was used to investigate the formation of irradiation-induced defects in proton-irradiated high-purity aluminum. The specimens were irradiated by 800-MeV protons to about 0.25 displacements per atom (dpa) in the Los Alamos Meson Physics Facility (LAMPF), producing about 20 atomic ppM helium, 130 atomic ppM hydrogen, and approximately 70 atomic ppM of spallation products. The as-irradiated microstructure mainly consisted of cavities with a mean size of 88 A, number density of 1 x 1015 cavities/cm3, and volume fraction of about 0.05%. The swelling was comparable to that of high-purity aluminum samples neutron-irradiated to the same displacement level. However, the high production rate of gas atoms during the proton irradiation increased the cavity number density by an order of magnitude relative to neutron irradiation, and reduced the cavity size by a factor of about 3. A postirradiation annealing treatment at 250°C resulted in complete disappearance of the small cavities and formaion of gas bubbles on grain boundaries.

Download or read book Defect Formation in 800 MeV Proton irradiated Aluminum written by Los Alamos Scientific Laboratory and published by . This book was released on 1979 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Energy Research Abstracts written by and published by . This book was released on 1987 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Analytic and Experimental Decay Heat Determinations of 800 MeV Proton Irradiated Aluminum written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Postirradiation radiochemistry analysis of 800-MeV proton irradiated ultrahigh purity aluminum has been done with standard gamma-ray counting equipment determining the Na22 activity in the activated aluminum. Results are compared to predicted values obtained from CINDER, a general nuclide depletion and fission-product code. This program can be used easily to calculate the activity of materials under arbitrary irradiation, provided that the source terms for the various radionuclides produced are known. The required production cross sections have been calculated by using the nucleon-meson transport code NMTC to determine the nuclear reactions produced by the protons, and the theory of Lindhard et al. to evaluate the resultant damage energy deposited in the target.

Download or read book Publications of LASL Research written by Los Alamos Scientific Laboratory and published by . This book was released on 1979 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Publications of Los Alamos Research written by Los Alamos National Laboratory and published by . This book was released on 1983 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Post Irradiation Dose Determination of 800 MeV Proton Irradiated Aluminum from LAMPF Experiment 407 written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stability Studies of Radiation Defects in Aluminum Introduced by 600 MeV Protons written by R. Gotthardt and published by . This book was released on 1987 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transmission Electron Microscopy (TEM) observations of 600-MeV proton irradiated aluminum reveal high concentrations of helium bubbles. Post irradiation annealing experiments show that the size and the distribution of these bubbles remain constant up to a temperature of about 770 K. Migration and coalescence have only been observed when the specimens were irradiated at 450 K and after annealing at 820 K. Electrical resistivity measurements show a strong increase that cannot be explained solely by the helium bubbles. This increase remains constant up to an annealing-temperature of 770 K. After the annealing treatments, no precipitation of transmutation atoms has been observed, which indicates that they are in solid solution or that they agglomerate in submicroscopic precipitates.

Download or read book Energy Research Abstracts written by and published by . This book was released on 1981 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes all works deriving from DOE, other related government-sponsored information and foreign nonnuclear information.

Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1980-10 with total page 1180 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book INIS Atomindex written by and published by . This book was released on 1987 with total page 874 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Irradiation Damage in Metals Produced by 800 MeV Protons written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Theoretical calculations of damage energies in metals from 800-MeV proton irradiation motivated an experimental transmission electron microscopy study of the damage produced. Damage produced by 800-MeV protons is accompanied by a higher level of helium production than for reactor neutron irradiation. To allow irradiation of samples on a routine basis, a proton irradiation port (PIP) was constructed in beam line A at LAMPF. This port allowed a high damage-rate irradiation of metal foils several mils thick. Irradiations were completed on foils of aluminum, niobium, molybdenum, and vanadium to damage levels between 0.05 dpa and several dpa, the damage occurring at homologous temperatures above 0.5 T/sub m/. Disks were punched from the irradiated foils and thinned for TEM examination. No voids were observed in irradiated aluminum samples. Molybdenum samples showed a low density of cavities which were believed to be gas filled at these high temperatures. Vanadium samples showed a high density of irradiation-produced defects resulting from irradiation-injected impurities. Such defects have been reported previously in ion-irradiated vanadium. The nature of the damage produced is compared to that found at lower temperatures following neutron or ion bombardment.

Download or read book Monthly Catalogue United States Public Documents written by and published by . This book was released on 1980 with total page 1542 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1974-07 with total page 978 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1987 with total page 1124 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metals Abstracts written by and published by . This book was released on 1994 with total page 1584 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Microstructural Changes in Commercial Aluminum Alloys Caused by Irradiation with 800 MeV Protons written by W. Lohmann and published by . This book was released on 1987 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Commercial Al-Mg and Al-Mg-Si alloys were irradiated in the Los Alamos Meson Physics Facility (LAMPF) with 800-MeV protons. The irradiation experiment was carried out at a temperature between 40 to 100°C to a dose level of