Nanophosphor aluminum oxide: Luminescence response of a potential dosimetric material

Blair, Michael W.; Jacobsohn, L.G.; Tornga, Stephanie C; Ugurlu, Ozan; Bennett, B. L.; Yukihara, E.G.; Muenchausen, R. E.

doi:10.1016/j.jlumin.2009.12.008

Cited by 40 publications

(16 citation statements)

References 26 publications

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“…In addition, it is of interest that annealing A NC coatings at 350 (curve 1), 400 (2), and 500°C (3) and NP at 350 (4) and 500°C (5) increases the lumi nescent activity, which is in good agreement with DSC TG data about the initiation of the transitions "amorphous state → γ phase" in the studied objects [69]. If the low TL and OSL responses of NPs and thin layers of Al 2 O 3 were noted in many studies of their luminescent properties [70][71][72], their unusually high values for part of the A NC coatings synthesized in this work, which are comparable with the analogous ones for TLD 500K, were observed for the first time.…”

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confidence: 85%

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Effect of iron doping on the properties of nanopowders and coatings on the basis of Al2O3 produced by pulsed electron beam evaporation

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Section: Introductionsupporting

confidence: 85%

“…Nevertheless, the Al 2 O 3 1% Fe 2 O 3 samples have a TL yield of no less than that for NP layers and Al 2 O 3 coatings prepared according to different technologies [70][71][72]. Moreover, since the phase transitions in the NANOTECHNOLOGIES IN RUSSIA Vol.…”

Section: Introductionmentioning

confidence: 99%

Effect of iron doping on the properties of nanopowders and coatings on the basis of Al2O3 produced by pulsed electron beam evaporation

et al. 2013

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“…The luminescent and dosimetric properties of a num ber of powder nanophosphors have been described in the literature [3][4][5][6][7][8]. It has been found that, for nanop owders of different chemical compositions, the possi bility exists of detecting high radiation doses.…”

Section: Introductionmentioning

confidence: 99%

Luminescent and dosimetric properties of nanostructured ceramics based on aluminum oxide

et al. 2013

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Abstract-The main features of thermoluminescence (TL) of nanostructured ceramics based on anion defective aluminum oxide have been investigated. The kinetic parameters of the TL dosimetric peak at 475 K have been determined. The possibility of using nanostructured ceramics for beta radiation dosimetry of high doses (up to 1 kGy) with thermoluminescence of deep traps has been justified. It has been found that the light sum of the dosimetric peak decreases with an increase in the heating rate due to the temperature quenching of the luminescence. The obtained results have confirmed that the mechanism of TL quenching in anion defective aluminum oxide is associated with the temperature dependence of the probability of the capture in deep traps, which can be caused by thermal ionization of excited states of F centers.

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confidence: 99%

“…The increased application of different forms of alu minum oxide in luminescence dosimetry-monoc rystal (detectors TLD 500K or α Al 2 O 3 :C [1]), pow der (Luxel on the basis of α Al 2 O 3 :C [1]), and thin layer (on the basis of nanopowders of Al 2 O 3 and nano structures [2,3])-is spurring on a search for novel technologies of production of materials on its basis with high sensitivity and selectivity for various types of ionizing radiation.…”

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Luminescent and dosimetric properties of thin nanostructured layers of aluminum oxide obtained using evaporation of a target by a pulsed electron beam

et al. 2013

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The increased application of different forms of alu minum oxide in luminescence dosimetry-monoc rystal (detectors TLD 500K or α Al 2 O 3 :C [1]), pow der (Luxel on the basis of α Al 2 O 3 :C [1]), and thin layer (on the basis of nanopowders of Al 2 O 3 and nano structures [2,3])-is spurring on a search for novel technologies of production of materials on its basis with high sensitivity and selectivity for various types of ionizing radiation.According to the NRB 99/2009 requirements of radiation safety, thin layer detectors are necessary for correct determination of the input of β radiation and the soft component (≤30 keV) of photonic radiation into an equivalent dose of the mixed β photonic radi ation fields. The mass thickness of its active layer should be 5 mg/cm 2 , which corresponds to the average thickness of the most radiation sensitive basal skin layer and equator of an eye lens [4]. Estimation of the linear thickness of the sensitive layer of the detector shows that, for the most available luminescence detec tor materials (LiF, Al 2 O 3 , BeO, MgO), its value is in the range 10-70 μm and depends on their density. The range of the registered equivalent doses for β radiation, for example, should be 1-5000 mSv. Hence, two opposite requirements are imposed upon the develop ment of thin layer detectors: high luminescence yield and low thickness of the active layer. It is essential to mention in this connection that examples of applica tion of thin layer detectors obtained from LiF : Mg, Ti Therefore, the purpose of this study is investigation of the luminescence and dosimetric properties of thin nanostructured layers of aluminum oxide obtained using a novel technology based on evaporation of a tar get with a pulse electron beam (ETPEB). Nanostructured layers (coatings) of aluminum oxide with a size of 7 × 7 mm and average thickness of 20 μm deposited with ETPEB on flat Al, steel, Cu, Ta, graphite, and quartz glass wafer with a thickness of 0.2-0.5 mm were used as the objects of the study. Al 2 O 3 nanoparticle coatings with a range of coherent scattering of 50-70 nm were applied under vacuum (residual pressure 4 Pa) using evaporation of a target made from highly purified α Al 2 O 3 powder (IAM (United States)) with a NANOBIM 2 instrument at an electron energy of 40 keV, pulse duration of 100 μs, frequency of 200 Hz, and pulse energy density of 0.56 J/mm 2 for 5 min [6]. X ray phase analysis (XPA) of the obtained samples was conducted with an XRD 7000 diffractometer (Shimadzu (Japan)) using CuK α radiation. TLD 500K moderate sensitivity detectors on the basis of monocrystal anion defective corun Abstract-Results of a study of optically and thermally stimulated luminescence (OSL and TL) of thin nano structured aluminum oxide coatings obtained with evaporation of the target by a pulsed electron beam and deposited on quartz glass, Al, steel, Cu, Ta, and graphite wafers are presented. It follows from data of X ray phase analysis that the obtained Al 2 O 3 layers have an amorphous nanocrystal structure with differe...

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Nanophosphor aluminum oxide: Luminescence response of a potential dosimetric material

Cited by 40 publications

References 26 publications

Effect of iron doping on the properties of nanopowders and coatings on the basis of Al2O3 produced by pulsed electron beam evaporation

Effect of iron doping on the properties of nanopowders and coatings on the basis of Al2O3 produced by pulsed electron beam evaporation

Luminescent and dosimetric properties of nanostructured ceramics based on aluminum oxide

Luminescent and dosimetric properties of thin nanostructured layers of aluminum oxide obtained using evaporation of a target by a pulsed electron beam

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