FADING EFFECT OF LiF:Mg,Ti AND LiF:Mg,Cu,P Ext-Rad AND WHOLE-BODY DETECTORS.

Area of Science:

• Radiation dosimetry
• Solid-state physics
• Materials science

Background:

• Thermoluminescence dosemeters (TLDs) are essential for personal and environmental radiation monitoring.
• Different TLD materials exhibit varying thermal stabilities, impacting measurement accuracy over time.
• Understanding TLD performance under diverse storage conditions is critical for reliable dosimetry.

Purpose of the Study:

• To compare the thermal stability of LiF:Mg,Ti (TLD-100) and LiF:Mg,Cu,P (TLD-100H) detectors.
• To evaluate the impact of different storage temperatures (0°C, room temperature, 40°C) and durations (8-120 days) on TLD signal intensity.
• To determine the suitability of these TLDs for various monitoring applications based on their stability.

Main Methods:

• Ext-Rad and whole-body card type TLDs utilizing LiF:Mg,Ti and LiF:Mg,Cu,P detectors were employed.
• Dosemeters were stored at controlled temperatures: 0°C, room temperature (RT), and 40°C.
• Storage periods included 8, 30, 45, 90, and 120 days, followed by thermoluminescence analysis.

Main Results:

• TLD-100H detectors demonstrated significantly higher TL signal stability than TLD-100 detectors.
• At 0°C, both TLD-100 and TLD-100H maintained constant signal intensity.
• At RT, TLD-100H showed stable signals, while TLD-100 had a maximum 22% variation over 120 days.
• At 40°C, TL signals decreased over time for both: TLD-100H showed max 12% variation, TLD-100 showed max 25% variation.

Conclusions:

• LiF:Mg,Cu,P (TLD-100H) offers superior thermal stability compared to LiF:Mg,Ti (TLD-100).
• TLD-100H is more reliable for long-term radiation monitoring, especially at room temperature and elevated temperatures.
• The findings support the use of TLD-100H for applications requiring high accuracy and stability in thermoluminescence dosimetry.