Thermoluminescence of LiF TLD-100: Emission-spectra measurements
The thermoluminescence of LiF TLD-100 dosimeter crystals was studied with equipment for determining simultaneously the emission intensity and spectrum as a function of temperature. Measurements were made on samples exposed to /sup 60/Co irradiations at room temperature at exposures varying from 500 to 3 x 10/sup 7/ R. Spectra were obtained at 1.38 and 5.5 /sup 0/C intervals over the temperature range 20--350 /sup 0/C. Below 10/sup 5/ R the thermoluminescent emission can be described by a single Gaussian-shaped band whose peak energy and full width vary irregularly with temperature and not in accord with the well-known expressions relating the emission-spectra peak energy and fwhm width to the sample temperature. However, the emission is accurately described by three Gaussian-shaped bands whose approximate peak energies and full widths are 3.01, 0.90; 2.90, 0.72; and 2.71, 0.96 eV. The peak energies and full widths of these three bands vary with temperature in the expected manner. In addition to these bands, comparatively low-intensity bands are observed at exposures above 10/sup 5/ R at approximately 4.0, 2.98, 2.50, and 2.3 eV, with the possibility of another band at roughly 1.5 eV. The recorded data for each emission band was subjected to all corrections required to obtain glow curves which are strictly proportional to the number of processes occurring per unit time; i.e., the corrected glow curves are as free as possible of the systematic errors which might render them unsuitable for determining the kinetics. The glow curves extend from room temperature to 350 /sup 0/C and contain nine prominent glow peaks. Below approximately 80 /sup 0/C, the emission is confined to the 2.71-eV band. Above approximately 200 /sup 0/C, the emission is confined to the 3.01-eV band. All three prominent emission bands contribute to the intermediate-temperature glow peaks. With increasing dose, the low-temperature peaks progressively diminish in intensity and the emission shifts to the higher-temperature peaks.
- Research Organization:
- Brookhaven National Laboratory, Upton, Long Island, New York 11973
- OSTI ID:
- 6776191
- Journal Information:
- J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 49:8; ISSN JAPIA
- Country of Publication:
- United States
- Language:
- English
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655003* -- Medical Physics-- Dosimetry
ALKALI METAL COMPOUNDS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
COBALT 60
COBALT ISOTOPES
DOPED MATERIALS
DOSE-RESPONSE RELATIONSHIPS
DOSEMETERS
DOSIMETRY
EMISSION SPECTRA
FLUORIDES
FLUORINE COMPOUNDS
GLOW CURVE
HALIDES
HALOGEN COMPOUNDS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IRRADIATION
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LITHIUM COMPOUNDS
LITHIUM FLUORIDES
LITHIUM HALIDES
LUMINESCENCE
LUMINESCENT DOSEMETERS
MEASURING INSTRUMENTS
MINUTES LIVING RADIOISOTOPES
NUCLEI
ODD-ODD NUCLEI
RADIOISOTOPES
SPECTRA
SPECTRAL SHIFT
TEMPERATURE DEPENDENCE
THERMOLUMINESCENCE
THERMOLUMINESCENT DOSEMETERS
THERMOLUMINESCENT DOSIMETRY
YEARS LIVING RADIOISOTOPES