Fading in CaF/sub 2/(Tm/Dy) TL phosphors used in environmental radiation monitoring

Conference · Wed Feb 01 04:00:00 EST 1989 · IEEE Trans. Nucl. Sci.; (United States)

OSTI ID:6175351

Bacci, C; Draghi, V; Furetta, C; Rispoli, B

Thermoluminescence dosimetry technique is currently used for occupational dosimetry and monitoring of supervised areas in the medical and industrial use of ionizing radiation. Recently, the problems about the potential effects of low dose levels, as those due to natural radiation or in the proximity of nuclear facilities, has produced a continuing interest in the study of thermoluminescent dosemeters for the measurement of environmental exposure. Undoubtedly, TLDs offer a number of advantages over other devices available for these purposes: they are small, relatively inexpensive, stable integrating detectors, which can be used in large number, placed everywhere, and assembled in a variety of arrangements. The aim of this paper is to report the fading observed for two different kind of calcium fluoride submitted to different climate conditions over storage time. CaF/sub 2/ (Dy/Tm) have been chosen because of their high sensitivity which makes them very useful in environmental dosimetry. On the other hand, the lower limit of the absorbed dose for CaF/sub 2/ is about 10/sup -6/Gy while for LiF is about 5x10/sup -5/Gy. Because the environmental absorbed dose in Italy is about 7x10/sup -5/Gy/month it is evident the usefulness of CaF/sub 2/ with respect to LiF.

• Research Organization: Physics Dept., Rome Univ., La Sapienza, P.le A. Moro, 2 Rome (IT)
• OSTI ID: 6175351
• Report Number(s): CONF-881103-
• Conference Information: Journal Name: IEEE Trans. Nucl. Sci.; (United States) Journal Volume: 36:1
• Country of Publication: United States
• Language: English

Related Subjects

440101 -- Radiation Instrumentation-- General Detectors or Monitors & Radiometric Instruments
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
500300* -- Environment
Atmospheric-- Radioactive Materials Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
654001 -- Radiation & Shielding Physics-- Radiation Physics
Shielding Calculations & Experiments
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM FLUORIDES
CALCIUM HALIDES
DOSES
DOSIMETRY
ELECTRON LOSS
ENVIRONMENT
ENVIRONMENTAL EXPOSURE PATHWAY
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
IONIZING RADIATIONS
LITHIUM COMPOUNDS
LITHIUM FLUORIDES
LITHIUM HALIDES
MEASURING INSTRUMENTS
MONITORING
NUCLEAR FACILITIES
OCCUPATIONAL EXPOSURE
PERFORMANCE
PHOSPHORS
RADIATION DETECTORS
RADIATION DOSES
RADIATION TRANSPORT
RADIATIONS
TEMPERATURE DEPENDENCE
THERMOLUMINESCENT DOSIMETRY
TRAPS