A Comparative Study of the Thermal Stability of LiF:Mg.Ti and LiF:Mg,Cu,P Detectors for Environmental Monitoring

Alves, José L. D.; Muñiz, J.L.; Gómez-Ros, J.M.; Delgado, Antonio

doi:10.1093/oxfordjournals.rpd.a032845

Cited by 12 publications

(6 citation statements)

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“…These stud ies have re ported the ex po nen tial de cay of third glow curve peak both be fore and af ter an ir ra di a tion and an in crease in the total area of fourth peak dur ing pre-and post-ir ra di a tion fad ing [43,45]. The peak four has been shown to have a high ther mal sta bil ity and fades in de pend ently of the tem per a ture whereas the low tem per a ture peaks de cay ex po nen tially and are strongly de pend ent on tem per ature [43]. The to tal TL out put has been re ported to post-ir ra di a tion fade up to 26 % [46].…”

Section: Fad Ing Re Duc Tionmentioning

confidence: 98%

Section: Fad Ing Re Duc Tionmentioning

confidence: 99%

“…Sev eral well-con ducted stud ies [43][44][45][46] have inves ti gated the pre-ir ra di a tion and post-ir ra di a tion fading rates of LiF:Cu,Mg,P. These stud ies have re ported the ex po nen tial de cay of third glow curve peak both be fore and af ter an ir ra di a tion and an in crease in the total area of fourth peak dur ing pre-and post-ir ra di a tion fad ing [43,45]. The peak four has been shown to have a high ther mal sta bil ity and fades in de pend ently of the tem per a ture whereas the low tem per a ture peaks de cay ex po nen tially and are strongly de pend ent on tem per ature [43].…”

Section: Fad Ing Re Duc Tionmentioning

confidence: 99%

“…An other study [43] in ves ti gated the ther mal stabil ity of LiF:Mg,Cu,P com pared to the more tra ditional LiF:Mg,Ti at 40 °C and 70 °C, to eval u ate the rel a tive im por tance of the tem per a ture/stor age induced ef fects on ei ther traps or trapped charges. The ob tained re sults con firm that, for both va ri et ies of LiF phos phor, the pro cess af fect ing their re spec tive main dosimetric peaks is not fad ing.…”

Section: Fad Ing Re Duc Tionmentioning

confidence: 99%

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Review of the thermoluminescent dosimetry method for the environmental dose monitoring

et al. 2021

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Passive solid state dosimeters, such as thermoluminescence dosimeters, provide integrated measurement of the total dose and are widely used in environmental monitoring programs. The objective of this paper is to provide a comprehensive review on the use of thermoluminescent dosimetry methods for monitoring radiation dose in the environment. The article presents the part of the research results of the project PREPAREDNESS (EMPIR 2016 call for Metrology for Environment joint research project) with a particular objective to harmonize procedures used by dosimetry services, relevant authorities and Institutes across the Europe. To achieve this, different monitoring routines that are based on passive environ mental dosimetry methods are investigated. Differences in performing specific steps such as preheating, reading, annealing, minimizing fading, and others, are analyzed. The investigation was performed by means of qualitative literature review that showed the lack of information about specific steps. The conclusion of this work is that thermoluminescent dosimetry measurement system has to be type-tested even though the testing procedure is complicated. In addition to this, control dosimeters should be introduced, International Organization for Standardization protocols should be followed during calibration, and finally, parameters influencing the measurement uncertainty have to be identified and well understood in order to pro duce ac cu rate dose measurement results.

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Section: Fad Ing Re Duc Tionmentioning

confidence: 98%

Section: Fad Ing Re Duc Tionmentioning

confidence: 99%

Section: Fad Ing Re Duc Tionmentioning

confidence: 99%

Section: Fad Ing Re Duc Tionmentioning

confidence: 99%

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Review of the thermoluminescent dosimetry method for the environmental dose monitoring

et al. 2021

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“…Following the respective storage periods all three sets were readout at the same time. The storage temperature and periods were chosen in order to induce changes on full and empty traps, respectively, in irradiated and non-irradiated dosemeters (Alves et al 1999).…”

Section: Sample Sizementioning

confidence: 99%

Assessment of the mean glandular dose using LiF:Mg,Ti, LiF:Mg,Cu,P, Li₂B₄O₇:Mn and Li₂B₄O₇:Cu TL detectors in mammography radiation fields

et al. 2016

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The aim of this paper is the characterization of four thermoluminescence detectors (TLD), namely, LiF:Mg,Ti, LiF:Mg,Cu,P, Li2B4O7:Mn and Li2B4O7:Cu for the measurement of the entrance surface air kerma (ESAK) and estimation of the mean glandular dose (MGD) in digital mammography examinations at hospitals and clinics. Low-energy x-ray beams in the typical energy ranges of mammography, produced with a tungsten target and additional 60 µm molybdenum filtration were implemented and characterized at the Laboratory of Metrology of Ionizing Radiation at Instituto Superior Técnico. These beams were used for the characterization of the TLDs in terms of sensitivity, linearity, reproducibility, energy dependence and fading at 40 °C. The energy dependence test was further extended using clinical beams produced by mammography units at hospitals and clinics. The method proposed by the International Atomic Energy Agency was used for the measurement of ESAK and assessment of MGD. The combined standard uncertainty for the measurement of ESAK (and MGD) was determined in accordance to the Guide to the expression of uncertainty in measurement. The x-ray beams generated in the 23-40 kVp range presented HVL values from 0.36 to 0.46 mm Al. The beam produced at 28 kVp (HVL 0.39 mm Al) was considered as reference. The radiation field defined a circle with 84 mm diameter with a maximum variation of the beam intensity of less than 1% at the top flat (plateau) within 4 cm of the central axis. The estimated total uncertainty for the measurement of air kerma was 0.42%. All the TL detectors tested showed good performance except the commercial Li2B4O7:Mn (or TLD-800) which was excluded due to its poor sensitivity in our experimental set up. Both lithium fluorides showed better linearity and reproducibility as well as lower energy dependence and fading when compared to lithium borates. The stable behaviour of LiF:Mg,Ti and LiF:Mg,Cu,P detectors is reflected in the low combined standard uncertainty of ±5.6% and ±4.3% respectively (or ±5.1% and ±3.6% if fading is neglected). In general a total combined uncertainty lower than ±10% for the measurement of ESAK was obtained for the four TL materials studied.

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Characterization of the glow-peak fading properties of six common thermoluminescent materials

Harvey

Haverland

Kearfott

2010

Applied Radiation and Isotopes

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A Comparative Study of the Thermal Stability of LiF:Mg.Ti and LiF:Mg,Cu,P Detectors for Environmental Monitoring

Cited by 12 publications

References 0 publications

Review of the thermoluminescent dosimetry method for the environmental dose monitoring

Review of the thermoluminescent dosimetry method for the environmental dose monitoring

Assessment of the mean glandular dose using LiF:Mg,Ti, LiF:Mg,Cu,P, Li₂B₄O₇:Mn and Li₂B₄O₇:Cu TL detectors in mammography radiation fields

Characterization of the glow-peak fading properties of six common thermoluminescent materials

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A Comparative Study of the Thermal Stability of LiF:Mg.Ti and LiF:Mg,Cu,P Detectors for Environmental Monitoring

Cited by 12 publications

References 0 publications

Review of the thermoluminescent dosimetry method for the environmental dose monitoring

Review of the thermoluminescent dosimetry method for the environmental dose monitoring

Assessment of the mean glandular dose using LiF:Mg,Ti, LiF:Mg,Cu,P, Li2B4O7:Mn and Li2B4O7:Cu TL detectors in mammography radiation fields

Characterization of the glow-peak fading properties of six common thermoluminescent materials

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Assessment of the mean glandular dose using LiF:Mg,Ti, LiF:Mg,Cu,P, Li₂B₄O₇:Mn and Li₂B₄O₇:Cu TL detectors in mammography radiation fields