RADIATION DAMAGE STUDIES USING THE TECHNIQUES OF ELECTRON-SPIN PARAMAGNETIC RESONANCE. Annual Progress Report, Period Covered May 1, 1960-April 30, 1961

Technical Report · Wed Mar 01 04:00:00 EST 1961

OSTI ID:4058090

Bray, P J; Williams, Jr, A O

>Work on the hyperfine structure observed in the ESPR of irradiated LiF was concluded. The ESPR of conduction electrons in heavily irradiated crystals was sought with success in the case of NaF. ESPR doublets of atomic hydrogen and tritium were observed in neutron-irradiated LiF single crystals which were subjected to thermal annealing. Weak signals from unannealed samples were found only in cases where the irradiation was carried out at higher temperatures. Hydrogen is presumed to be introduced by the breaking up of OH radicals trapped in the LiF crystal during its growth, and tritium is introduced in the lattice during neutron irradiation by the reaction, Li/sup 6/(n alpha )H/sup 3/. Effort was directed toward the interpretation of the ESPR spectra of irradiated borosilicate glasses obtained previously. It is thought that the broad line with the 5-line hyperfine structure is caused by the paramagnetic centers produced in the networks of boron and alkali oxides in the glasses. The sharp resonance that appeared in the case of neutron irradiation was identified as a trapped electron resonance in the silica network in the borosilicate commercial glasses. (auth)

• Research Organization: Brown Univ., Providence
• NSA Number: NSA-15-014809
• OSTI ID: 4058090
• Report Number(s): TID-11864
• Country of Publication: United States
• Language: English

Related Subjects

ALKALI METALS
ANNEALING
BORON
BORON SILICATES
CRYSTALS
DECOMPOSITION
ELECTRONS
GLASS
HYDROGEN
HYDROXIDES
HYPERFINE STRUCTURE
IRRADIATION
LATTICES
LITHIUM 6
LITHIUM FLUORIDES
MAGNETIC RESONANCE
METALS, CERAMICS, AND OTHER MATERIALS
NEUTRON BEAMS
NUCLEAR REACTIONS
OXIDES
RADIATION EFFECTS
SILICON OXIDES
SPECTRA
SPIN
TEMPERATURE
TRAPS
TRITIUM