Dosimetric properties of Li₂B₄O₇:Cu,Ag,P solid detector.

Area of Science:

• Materials Science
• Radiation Dosimetry
• Solid State Physics

Background:

• Lithium borate (Li2B4O7) is a known host material for thermoluminescence (TL) dosimeters.
• Doping Li2B4O7 with various ions can enhance its dosimetric properties.
• Optimizing dopant concentrations and preparation methods is crucial for improving TL material performance.

Purpose of the Study:

• To synthesize and characterize a new Li2B4O7:Cu,Ag,P material for radiation dosimetry.
• To evaluate the thermoluminescence response and dosimetric properties of the prepared material.
• To assess the suitability of Li2B4O7:Cu,Ag,P for clinical radiation applications.

Main Methods:

• Synthesis of lithium borate (Li2B4O7) via chemical reaction of lithium carbonate and boric acid.
• Doping the host salt with copper (Cu), silver (Ag), and phosphorus (P) ions.
• Production of sintered pellets and exposure to gamma radiation from a 60Co source.
• Analysis of thermoluminescence (TL) response, sensitivity, linearity, lower detection limit (LDL), fading, repeatability, and glow curve characteristics.

Main Results:

• The Li2B4O7:Cu,Ag,P sample with 0.45 mol% Cu, 0.45 mol% Ag, and 12 mol% P, thermally treated at 1123 K for 2 h, showed the highest sensitivity.
• The TL response demonstrated linearity in the dose range of 0.005 to 100 Gy.
• The material exhibited a low fading rate (3% in 10 days, 9% in 30 days) and good repeatability (4.15% variability coefficient).
• The LDL was determined to be 6.10 μGy.

Conclusions:

• The developed Li2B4O7:Cu,Ag,P material demonstrates excellent dosimetric properties, including high sensitivity and linearity.
• The material's low fading and good repeatability suggest its reliability for radiation measurements.
• The findings indicate that Li2B4O7:Cu,Ag,P is a promising candidate for dosimetry in clinical radiation applications.