Lithium borate solid TL detectors

Prokić, M.

doi:10.1016/s1350-4487(01)00039-7

Cited by 151 publications

(63 citation statements)

References 3 publications

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“…In spite of the fact that powder lithium tetraborate is claimed to be inconvenient for the use in this area, Panasonic utilizes this product in TLD badges [9]. Hence, it is obvious that the problems faced during laboratory period can easily be overcome during the commercial stage by an automatic system, since the main difficulty is to get exactly the same weight of the powder during thermoluminescence measurements.…”

Section: Synthesis Of Lithium Tetraboratementioning

confidence: 99%

“…This method was applied by Furetta [12] who performed wet reaction with stoichiometric amounts of Li 2 CO 3 and H 3 BO 3 . The same method was applied by Prokic [9] in 2001 and Ege in 2007 [13]. Thirdly, solid state synthesis option was performed by Sangeeta [14] whose production procedure followed was milling and homogenizing Li 2 CO 3 and H 3 BO 3 powders and sintering the mixture at 700 o C for 48 hours.…”

Section: Synthesis Of Lithium Tetraboratementioning

confidence: 99%

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An Overview on Preparation and TL Characterization of Lithium Borates for Dosimetric Use

Pekpak¹,

Yılmaz²,

Özbayoğlu³

2010

TOMPJ

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Boron that appears in borate form in nature is an essential additive to a variety of industrial products. Recently, certain boron compounds have attracted attention in high technology utilization areas owing to their special crystal and optical characteristics. Thermoluminescent (TL) dosimetry that is used to record amount of radiation exposure is one of such areas. Two borates searched for candidacy in TL dosimetry are lithium tetraborate and lithium triborate. These materials are synthesized and metal doped by numerous researchers to be tested for thermoluminescence response. Lithium tetraborate has aroused interest of scientists since 1960s by the courtesy of the thermoluminescence (TL) property. However, lithium triborate is rather new in this area. This study compromises a broad overview including synthesis methods employed for the production of these two materials. Furthermore, the TL properties that have significant effect on the TL dosimetry potential of a compound are noted along with the detailed information on TL measurement procedure specifications.Keywords: Thermoluminescence, dosimetry, lithium borates, synthesis, doping, characterization. BORATESThere are several natural and synthetic borates used in different branches of industry. Natural borates are generally cleaned from their impurities in processing plants and are further treated to more qualified end products (like boric acid, anhydrous boric acid, anhydrous borax, borax pentahydrate,borax decahydrate and sodium perborate) in recrystallizer units. Besides, the variability of borate crystal chemistry [1] allows researchers synthesize numerous borate structures usable in high technology areas. Thermoluminescent (TL) dosimetry used to measure radiation exposure is an important high technology utilization area for these synthetic borates. General Uses of Borates in High TechnologyIt is certain that the interesting crystal structure of borates play an important role for its utilization in high technology. Although the utilization variety of borates is strongly related to its structural variety, in this communication we will concentrate on results of these characteristics rather than chemical background. Indeed, there is extensive number of studies devoted to the crystal structures of borates [1][2][3] which may be refered for detailed information.Owing to the varied crystallinity borates possess large electronic band gaps, attractive nonlinear optical (NLO) properties, chemical and environmental stability, and mechanical strength [3]. Hence, they found wide use in *Address correspondence to this author at the Middle East Technical University, Mining Engineering, Ankara, Turkey; Tel: +903122102664; Fax: +903122105822; E-mails: epekpak@metu.edu.tr, ayseny@metu.edu.tr nonlinear optical technologies as well as in thermoluminescence dosimetry.Borates have high UV transmittance at wavelengths down to 155 nm [4]. Therefore, they are appropriate for the use in plasma displays and in laser technology. Furthermore they are strong phosphors which ...

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Section: Synthesis Of Lithium Tetraboratementioning

confidence: 99%

Section: Synthesis Of Lithium Tetraboratementioning

confidence: 99%

An Overview on Preparation and TL Characterization of Lithium Borates for Dosimetric Use

Pekpak¹,

Yılmaz²,

Özbayoğlu³

2010

TOMPJ

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“…Annealing process is crucial before making any irradiations and subsequent TL measurements in prior to achieve highest reproducibility for both background and TL signal. According to Prokic [13], this process also allows to eliminate the effect of previous irradiation. The TL intensity of the 0.3 mol% Dy-doped glass sample against annealing temperature was measured and the summary results are shown in Fig.…”

Section: Optimum Annealing Temperaturementioning

confidence: 99%

Thermoluminescent properties of Dy doped calcium borate based glass for dose measurement subjected to photon irradiation

et al. 2017

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Abstract. This study presents the thermoluminescent (TL) dosimetric properties of calcium borate glass with various dopant concentration of dysprosium (Dy). Calcium borate glass is a new potential material to be used in radiation measurement with absorption coefficient that is close to human bone. A series of glasses based on chemical equation xCaO-(100-x) B2O3 system, x = 0.1, 0.2, 0.3, 0.4, 0.5 (0≤ x ≤100) ％ weight have been prepared by melt quenching method. The X-ray diffraction analysis of glass samples were carried out and the result showed a broad peak, which confirmed the amorphous nature of the glass. The 70B2O3-30CaO glass sample was found as the most stable among other glass samples studied. Present work focuses on 70B2O3-30CaO glass of (0.01-0.4) mol% Dy-doped in order to investigate the thermoluminescence (TL) properties, in particular, dose-response and fading. The glass samples were irradiated to dose range of 0.5-4.0 Gy subjected to 6MV photon irradiations of LINAC Primus MLC 3339. TL response of 0.3 mol% Dy-doped 70B2O3-30CaO glass was found to produce highest response, with good linear doseresponse relationship.

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“…The use of copper activator instead of manganese in lithium borate overcomes the drawback of poor TL sensitivity, and TL emission spectra are about 360 nm [3] . However, this phosphor is produced in powder, which is inconvenient for the routine dosimetric use [4] .Li 2 B 4 O 7 :Cu,In and Li 2 B 4 O 7 :Cu,In,Ag in the form of sintered pellets were prepared at the end of the 20th century. The sintered pellets are tissue equivalent to photon radiation and have a wide linear dose response range with a TL sensitivity which is similar to that of LiF:Mg,Ti, but these TL materials are sensitive to light and the room temperature fading is obvious [1,4] .…”

mentioning

confidence: 99%

“…However, this phosphor is produced in powder, which is inconvenient for the routine dosimetric use [4] .…”

mentioning

confidence: 99%

Investigation of thermoluminescence in Li2B4O7 phosphors doped with Cu, Ag and Mg

2007

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Li 2 B 4 O 7 (LBO):Cu,Ag,Mg phosphors have been prepared by the sintering technique.The roles of the Ag and Mg dopants in the phosphors have been studied using the methods of thermoluminescence (TL) glow curves and TL 3D spectra. The results indicated that proper concentrations of Ag and Mg can enhance the TL of LBO:Cu. It was also indicated that the intensity of TL peak at ~130 is reduced with ℃ the increasing Ag concentration, and enhanced with the increasing Mg concentration.From the TL 3D spectra, three emission bands (λ 1 = 421 nm, λ 2 = 380 nm, λ 3 = 350 nm) were observed: the intensity of low energy emission band is reduced and that of the high energy is enhanced with the increasing dopant Ag; on the contrary, the intensity of low energy emission band is enhanced and that of the high energy one is reduced with the increasing dopant Mg.thermoluminescence, spectra, borate lithium Li 2 B 4 O 7 phosphors with an effective atomic number Z eff = 7.3 are very close to that of biological tissue 7.4, thus attracting much attention [1] . The first TL material based on lithium borate which was introduced in dosimetry was Li 2 B 4 O 7 :Mn phosphor with low TL sensitivity caused partly by the emission in the 600 nm region of the spectra, far from the response region of most photomultipliers [2] . The use of copper activator instead of manganese in lithium borate overcomes the drawback of poor TL sensitivity, and TL emission spectra are about 360 nm [3] . However, this phosphor is produced in powder, which is inconvenient for the routine dosimetric use [4] .Li 2 B 4 O 7 :Cu,In and Li 2 B 4 O 7 :Cu,In,Ag in the form of sintered pellets were prepared at the end of the 20th century. The sintered pellets are tissue equivalent to photon radiation and have a wide linear dose response range with a TL sensitivity which is similar to that of LiF:Mg,Ti, but these TL materials are sensitive to light and the room temperature fading is obvious [1,4] . The TL materials based on Li 2 B 4 O 7 are very promising and attract people to investigate deeply [5,6] .The OSL (Optical stimulated luminescence) characteristic [7] and bleach [8] have been studied and the roles of dopants Ag and Mg in Li 2 B 4 O 7 :Cu are discussed in this study.

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Lithium borate solid TL detectors

Cited by 151 publications

References 3 publications

An Overview on Preparation and TL Characterization of Lithium Borates for Dosimetric Use

An Overview on Preparation and TL Characterization of Lithium Borates for Dosimetric Use

Thermoluminescent properties of Dy doped calcium borate based glass for dose measurement subjected to photon irradiation

Investigation of thermoluminescence in Li2B4O7 phosphors doped with Cu, Ag and Mg

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