Enhancements in luminescence measurement techniques

Area of Science:

• Geochronology
• Luminescence Dating
• Solid State Physics

Background:

• Traditional Thermoluminescence (TL) and Optically Stimulated Luminescence (OSL) systems have limitations in investigating complex thermal and recombination effects.
• The need for advanced instrumentation to probe shallow traps and competition effects during luminescence measurements is critical.

Purpose of the Study:

• To introduce and describe new capabilities of the Risø TL/OSL system.
• To demonstrate the application of elevated temperature irradiation and radioluminescence (RL) measurement facilities.
• To investigate trap competition and recombination processes during sample storage and measurement.

Main Methods:

• Software-controlled heater for elevated temperature irradiation during beta exposure.
• Linearly modulated OSL (LM-OSL) for varying stimulation power.
• Measurement of Thermoluminescence (TL), OSL, and Radioluminescence (RL) in a single automated sequence.
• Combined TL/OSL/RL reader system.

Main Results:

• The new system enables simultaneous measurement of TL, OSL, and RL.
• Elevated temperature irradiation allows investigation of competition effects from shallow traps.
• Preliminary data suggests trap competition during storage and changes in recombination pathways.
• LM-OSL provides new parameters for characterizing luminescence signals.

Conclusions:

• The enhanced Risø TL/OSL system offers expanded capabilities for luminescence dating and related research.
• The new facilities provide valuable insights into charge carrier dynamics in minerals.
• Further research using these advanced techniques will refine luminescence dating models and applications.