LUMINESCENCE OF THE URANIUM-ACTIVATED LITHIUM AND SODIUM FLUORIDE MONOCRYSTALS

Journal Article · Sat Apr 01 04:00:00 EST 1961 · Izvest. Akad. Nauk S.S.S.R., Ser. Fiz.

OSTI ID:4018016

Belayev, L M; Dobrzhanskii, G F; Feofilov, P P

The high intensity of the luminescence of LiF and NaF activated by U is used for determining the U concentration of LiF and NaF powders and melts. Use of monocrystals which have an NaCl-type cubic lattice, makes it possible to apply polarization methods. The U is introduced in the system in the form of U)/sub 2/ nitrate, sulfate or acetate, yielding ultimately U/sub 3/O/sub 8/ below the melting point of the pure crystal. During the tests the U concentration was varied from 0.01 to 0.3%. The absorption maxima of the NaF--U system were at about 555, 535, 430, 365, and 275 m mu ; those of the LiF--U system were at about 520, 505, 405 (?), and 310 m mu . Upon cooling from room temperature to liquid N temperature the bands were divided into numerous narrow lines. Luminescence has been noticed in both the visible and ultraviolet range, being changed agaln into a number of small lines at liquid N temperature with a width often below 1 A. The polarization spectra were found to be similar to the spectra of organic dyes. Study of the lowtemperature polarization showed that U behaves like the rare- earth elements, being an electric and magnetic dipole emitter. The luminescence of the hexavalent U may be considered as the superposition of forced electric and magnetic transitions. A regular alternation of the sign of the polarization of the strongest luminescence line has been noted, attributing it to an alterration between electric and magnetic types of phenomena. (TTT)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-15-025318
• OSTI ID: 4018016
• Journal Information: Izvest. Akad. Nauk S.S.S.R., Ser. Fiz., Journal Name: Izvest. Akad. Nauk S.S.S.R., Ser. Fiz. Vol. Vol: 25
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

ABSORPTION
ACETATES
CONFIGURATION
COOLANTS
COOLING
DIPOLES
DYES
ELECTRIC FIELDS
EXCITATION
LATTICES
LIGHT
LIQUIDS
LITHIUM FLUORIDES
LOW TEMPERATURE
LUMINESCENCE
MAGNETIC FIELDS
MELTING
MELTING POINTS
MONOCRYSTALS
NITROGEN
ORGANIC COMPOUNDS
PHYSICS
POLARIZATION
POWDERS
QUANTITATIVE ANALYSIS
QUANTITY RATIO
SODIUM FLUORIDES
SPECTRA
SPECTROSCOPY
SULFATES
TEMPERATURE
TESTING
TRACE AMOUNTS
TRANSIENTS
U3O8
ULTRAVIOLET RADIATION
URANIUM
URANYL COMPOUNDS
URANYL NITRATES
USES
VARIATIONS