Optimized readout system for cooled optically stimulated luminescence

Conference · Sat Sep 01 00:00:00 EDT 1990

OSTI ID:6801511

Miller, S D; Eschbach, P A

Cooled Optically Stimulated Luminescence (COSL) in CaF{sub 2}:Mn is an ionizing radiation dosimetry method recently developed at the Pacific Northwest Laboratory (PNL). In this method CaF{sub 2}:Mn crystals irradiated by gamma radiation at room temperature are cooled to liquid nitrogen temperature (77K), stimulated by ultraviolet laser light at 326 nm, and allowed to warm to room temperature. Light emission proportional to the gamma exposure occurs as the TLD warms from liquid nitrogen temperature to room temperature. The new method is an example of a highly sensitive phototransfer technique which could form the basis for future radiation dosimetry applications. Measurements to date have shown high potential for measuring gamma exposures in the range of 10 {mu}R. The high sensitivity of the COSL technique is due in part to the larger quantum efficiency of radiative recombination at low temperatures and to the complete absence of the incandescent background associated with conventional thermoluminescent readout methods. Along with the potential for a system which is more sensitive than thermoluminescent readers, multiple COSL readouts can be performed with minimal reduction in the COSL intensity. The multiple readout capability can serve as a possible permanent dosimetry record, thus allowing the reanalysis of a questionable reading. In an attempt to optimize the sensitivity of the COSL method, a new readout system is being developed. 8 refs., 7 figs.

• Research Organization: Pacific Northwest Lab., Richland, WA (USA)
• Sponsoring Organization: DOE/NE
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 6801511
• Report Number(s): PNL-SA-18025; CONF-900903-1; ON: DE91000150
• Resource Relation: Conference: 8. general conference of the European Physical Society, Amsterdam (Netherlands), 4-8 Sep 1990
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
DOSEMETERS
OPTIMIZATION
CALCIUM FLUORIDES
DISPLAY DEVICES
DOSIMETRY
GAMMA RADIATION
LUMINESCENCE
MANGANESE
QUANTUM EFFICIENCY
SENSITIVITY
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM HALIDES
COMPUTER OUTPUT DEVICES
COMPUTER-GRAPHICS DEVICES
EFFICIENCY
ELECTROMAGNETIC RADIATION
ELEMENTS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
IONIZING RADIATIONS
MEASURING INSTRUMENTS
METALS
RADIATIONS
TRANSITION ELEMENTS
440102* - Radiation Instrumentation- Radiation Dosemeters