FADING EFFECT OF LiF:Mg,Ti AND LiF:Mg,Cu,P Ext-Rad AND WHOLE-BODY DETECTORS.
Thermoluminescence dosemeters are widely used in individual and environmental monitoring. The aim of this work was to compare the thermal stability of dosemeters of the Ext-Rad and whole-body card types with LiF:Mg,Ti and LiF:Mg,Cu,P detectors stored at different temperatures and periods. The dosemeters were stored at 0°C, room temperature and 40°C for periods that lasted 8, 30, 45, 90 and 120 d. In general, TLD-100H detectors present higher TL signal stability than TLD-100 detectors. The intensity of the signal remained constant for both materials for storage periods at 0°C. At RT the same results was observed for TLD-100H. For TLD-100 detectors, a maximum variation of 22 % was registered for the longest period. At 40°C the TL signal decreased with storage time for both detectors. The TL signal of TLD-100H detectors presented maximum variations of 12 % whereas for TLD-100 detectors, larger variations of 25 % were observed.
Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), 2986-066 Bobadela LRS, Portugal UL-IST, Centro de Ciências e Tecnologias Nucleares (C2TN), EN 10 (ao km 139,7), 2986-066 Bobadela LRS, Portugal joanaper7@ctn.ist.utl.pt.
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Pereira
Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), 2986-066 Bobadela LRS, Portugal.
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Pereira
Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), 2986-066 Bobadela LRS, Portugal.
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Rangel
Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), 2986-066 Bobadela LRS, Portugal.
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Saraiva
Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), 2986-066 Bobadela LRS, Portugal.
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Santos
Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), 2986-066 Bobadela LRS, Portugal.
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Cardoso
Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico (IST), Universidade de Lisboa (UL), Estrada Nacional 10 (ao km 139,7), 2986-066 Bobadela LRS, Portugal UL-IST, Centro de Ciências e Tecnologias Nucleares (C2TN), EN 10 (ao km 139,7), 2986-066 Bobadela LRS, Portugal.
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Alves
D004781:Environmental Exposure / Q000032:analysis; D005459:Fluorides / Q000032:analysis; D006801:Humans; D018020:Lithium Compounds / Q000032:analysis; D008274:Magnesium / Q000032:analysis; D015588:Observer Variation; D010758:Phosphorus / Q000032:analysis; D011829:Radiation Dosage; D000072232:Radiation Dosimeters; D011834:Radiation Monitoring / Q000295:instrumentation / Q000379:methods*; D011835:Radiation Protection / Q000295:instrumentation / Q000379:methods*; D013696:Temperature; D013819:Thermoluminescent Dosimetry / Q000295:instrumentation* / Q000379:methods*; D013997:Time Factors; D014025:Titanium / Q000032:analysis; D014915:Whole-Body Counting
D018020:Lithium Compounds; D010758:Phosphorus; D014025:Titanium; D008274:Magnesium; D005459:Fluorides