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Thermoluminescent properties of MgO co-doped with different lanthanides
P R González1, D Mendoza-Anaya1, O Ávila1
1Instituto Nacional de Investigaciones Nucleares, Carretera México-Toluca S/N, La Marquesa, Estado de México C.P., 52750, Ocoyoacac, Mexico.
Summary
Magnesium oxide doped with samarium and terbium (MgO:Sm,Tb) shows enhanced thermoluminescence (TL) sensitivity and linearity for radiation dosimetry. This material exhibits a low detection limit and stable readings, making it a promising candidate for dosimetric applications.
Area of Science:
- Materials Science
- Solid State Physics
- Radiation Detection
Background:
- Magnesium oxide (MgO) based materials are explored for thermoluminescence (TL) dosimetry.
- Co-doping MgO with lanthanides can modify its TL properties.
- Understanding the influence of co-dopants on TL response is crucial for material development.
Purpose of the Study:
- To synthesize and characterize MgO co-doped with samarium (Sm) and other lanthanides.
- To evaluate the thermoluminescence properties of these materials for radiation dosimetry.
- To identify the optimal composition for sensitive and reliable dosimeters.
Main Methods:
- Solution combustion synthesis of MgO:Sm,Ln powders.
- Pellet fabrication and sintering for dosimeter preparation.
- Thermoluminescence (TL) measurements under 60Co gamma irradiation.
- Analysis of glow curves using the initial rise, plateau, and peak shape methods (PS, SQPGCD).
Main Results:
- MgO:Sm,Tb (0.4 mol% Sm, 0.1 mol% Tb) exhibited the highest TL sensitivity.
- This sample showed a 100% increase in sensitivity compared to MgO:Sm alone.
- Linearity was observed up to 500 Gy with a low detection limit of 0.12 mGy.
- The material demonstrated general order kinetics for its dosimetric peak.
- Ce co-doping in MgO:Sm,Ce acted as an inhibitor for the TL signal.
Conclusions:
- MgO:Sm,Tb is a highly promising thermoluminescent material for radiation dosimetry.
- Its enhanced sensitivity, linearity, and low detection limit meet key dosimetric requirements.
- Further investigation into MgO:Sm,Tb could lead to advanced radiation detection devices.
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