RADIATION DAMAGE STUDIES IN SOLIDS USING THE TECHNIQUES OF ELECTRON-SPIN PARAMAGNETIC RESONANCE AND NUCLEAR MAGNETIC RESONANCE. Annual Progress Report, May 1, 1962-April 30, 1963

Technical Report · Fri Mar 01 04:00:00 EST 1963

OSTI ID:4739322

Bray, P J; Hooper, H O

Nuclear magnetic resonance (NMR) techniques were used to examine the potassium halides. Attempts were made to obtain crystals with low dislocation contents in order to simplify the analysis of the NMR spectra before and after neutron irradiation. Data indicate that the F-center intensity measurements by electron spin resonance (ESR) show a close correspondence with the changes in NMR spectra for both KBr and KI irradiated with neutrons. Temperature monitoring inside LiF crystals during neutron irradiation indicates temperature rises to at least 160 nif- C when the samples are irradiated in an air-cooled facility. The temperature of some samples of LiF reached 300 nif- C. The temperature is dependent upon the neutron flux, the cooling air of the facility, and the manner in which the samples are packaged and placed in the facility. The ESR studies of Fcenters in neutron-irradiated crystals of LiF were conducted on crystals of 99.99 at.% Li and 95.6 at.% Li rather than the normal isotopic abundance of Li. Preliminary studies of radiation damage effects in LiBr and LiI by NMR techniques are discussed. ESR studies were conducted on irradiated alkali borate glasses with high oxide concentrations and glasses in the CaO-B/sub 2/O/sub 3/--Al/sub 2/O/sub 3/ system. The irradiated alkali borate glasses containing >30 mol% alkali oxide show a spectrum of four equally spaced lines which differs from the five-line spectrum found previously in irradiated alkali borate glasses containing < 25 mol% alkali oxide. This five-line spectrum was successfully analyzed in terms of the theoretical ESR line shape for the case of powder or glassy materials. An appropriate spinHamiltonian was found for the center responsible for the five-line structure. (auth)

• Research Organization: Brown Univ., Providence
• NSA Number: NSA-17-018863
• OSTI ID: 4739322
• Report Number(s): TID-18438
• Country of Publication: United States
• Language: English

Related Subjects

AIR
ALKALI METALS
ALUMINUM OXIDES
BERYLLIUM OXIDES
BORATES
CALCIUM OXIDES
COOLING
CRYSTALS
DEFECTS
DISLOCATIONS
ELECTRONS
GLASS
HALIDES
ISOTOPES
LITHIUM BROMIDES
LITHIUM FLUORIDES
LITHIUM IODIDES
MAGNETIC RESONANCE
MEASURED VALUES
METALS, CERAMICS, AND OTHER MATERIALS
MONITORING
NEUTRON BEAMS
NEUTRON FLUX
NUCLEAR MAGNETIC RESONANCE
OXIDES
POTASSIUM BROMIDES
POTASSIUM COMPOUNDS
POTASSIUM IODIDES
QUANTITY RATIO
RADIATION EFFECTS
SOLIDS
SPECTRA
TEMPERATURE