RADIATION DAMAGE STUDIES IN SOLIDS NUCLEAR RESONANCE ABSORPTION TECHNIQUE. Progress Report for Period covered: November 1, 1959 to November 1, 1960

Technical Report · Tue Nov 01 04:00:00 EST 1960

OSTI ID:4097651

Bray, P J

Nuclear magnetic resonance (NMR) studies, coupled with electron-spin paramagnetic resonance (ESPR) experiments, on crystals of neutron-irradiated LiF show that there are three successive total neutron-flux intervals in which different types of irradiation effects are observed. ESPR data indicate that the number of electron spins produced by the irradiation grows proportionally to the neutron flux up to l0/sup 16/ nvt, above which the spin concentration saturates. Above 10/sup 16/ nvt the NMR studies show that the intensity of the narrow fluorine line (attributed to gas formation) grows proportionally to the flux up to l0/sup 19/ nvt, where it saturates. Above 10/sup 19/ nX the lithium metal NMR absorption line becomes observable. It is concluded that the lithium metal ions collect in clusters to form colloids of substantial size within the crystal. Theoretical studies are now being conducted to determine the size and nature of these formations. similar experiments performed on heavily irradiated NaF do not show any observable gas or metal NMR absorption lines. This is contrary to calculations which predict sufficient gas formation for NMR detection. At the present time, other NMR methods of measuring the irradiation effects are being employed. Final measurements of different alkali-halide series are now being conducted. These series include the lithium halides, LiI, LiCl, and LiBr; the alkali iodides, KI, NaI, and LiI; and the alkali bromides, LiBr, NaBr, and KBr. Preliminary studies of conductive materials such as semiconductors and metals were completed, and irradiation programs are being undertaken. (auth)

• Research Organization: Brown Univ., Providence
• NSA Number: NSA-15-009511
• OSTI ID: 4097651
• Report Number(s): TID-11057
• Country of Publication: United States
• Language: English

Related Subjects

ALKALI METALS
COLLOIDS
CRYSTALS
DISTRIBUTION
ELECTRONS
FLUORINE
GASES
HALIDES
IONS
IRRADIATION
LITHIUM
LITHIUM FLUORIDES
MAGNETIC RESONANCE
MEASURED VALUES
METALS
METALS, CERAMICS, AND OTHER MATERIALS
NEUTRON BEAMS
NEUTRON FLUX
NUCLEAR MAGNETIC RESONANCE
PRODUCTION
QUANTITATIVE ANALYSIS
QUANTITY RATIO
RADIATION EFFECTS
SEMICONDUCTORS
SODIUM FLUORIDES
SOLIDS
SPECTRA
SPIN