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ABSTRACT: In the present work thermoluminescent (TL) response of zirconium oxide (ZrO2) nanostructured induced by mammography X-ray radiation was investigated. Measurements were made of the response per unit air kerma of ZrO2 with mammography equipment parameters (semiautomatic exposure control, 24 kVp and 108 mAs). The calibration curves were obtained by simultaneously irradiating ZrO2 samples and ion chamber. Samples of ZrO2 showed a linear response as a function of entrance skin air kerma. The observed results in TL properties suggest that ZrO2 nanostructured could be considered as an effective material for X-ray beams dosimetry if appropriate calibration procedures are performed.
Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine 02/2012; 70(7):1400-2. · 1.09 Impact Factor
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ABSTRACT: The present paper reports the experimental results of dysprosium doped calcium sulphate (CaSO4:Dy) films deposited by spray pyrolysis method. CaSO4:Dy films were deposited on three different surfaces: glass, aluminum and quartz substrates at temperatures in the range from 450 to 600 °C. Structural and morphological characteristics of CaSO4:Dy films were observed. Thermoluminescent characteristics of films were determined by irradiating ultraviolet energy region. Thermoluminescent glow curve of CaSO4:Dy films with glass and aluminum substrates showed a peak under environmental irradiation. Both TL response glow shape and intensity of CaSO4:Dy films UV irradiated as a function of substrates were studied.
Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine 12/2011; 70(7):1403-6. · 1.09 Impact Factor
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ABSTRACT: This paper presents the results of the preparation and characterization of dysprosium-doped calcium sulfate (CaSO(4):Dy) phosphor, which was obtained by homogeneous precipitation from calcium acetate Ca(CH(3)COO(-))(2). Structural and morphological characteristics were studied using a scanning electronic microscope (SEM). The structure of all compounds was determined by X-ray diffraction method too. Thermoluminescence (TL) emission properties of CaSO(4):Dy under gamma radiation effects were studied. This phosphor powder presented a TL glow curve with two peaks (Tmax) centered at around of 180 and 300 degrees C, respectively. The TL response of CaSO(4):Dy as a function of gamma absorbed dose was linear in a wide range. Both emission and excitation spectra were also obtained. Results showed that this new preparation method of CaSO(4):Dy TL phosphor is less expensive, cleaner and safer than the conventional preparation method.
Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine 09/2009; 68(4-5):623-5. · 1.09 Impact Factor
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ABSTRACT: This work describes an algorithm for absorbed dose evaluation in the region of X-ray diagnostic energy based on the response of CaSO4:Dy thermoluminescence powder detectors. The absorbed dose was calculated using Monte Carlo simulation code (MCSC) and then compared to the experimental TLD results for X-rays effective energies 60Co gamma radiation. In order to study the photon interaction in the matter, a cylindrical model of 1 cm3 was used. The gamma radiation source was placed at 100 cm to the object; the source is considered as an isotropic source of 60Co. The energy deposited into the cylindrical model was determined by the Monte Carlo N-particle (MCNPX) method. Measurements of the TL phosphors were obtained by irradiating the powder by gamma radiation. TL glow curve of CaSO4:Dy after gamma irradiated at a 1 Gy of absorbed dose was then obtained.
Applied Radiation and Isotopes.
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ABSTRACT: This work describes an algorithm for absorbed dose evaluation in the region of X-ray diagnostic energy based on the response of CaSO(4):Dy thermoluminescence powder detectors. The absorbed dose was calculated using Monte Carlo simulation code (MCSC) and then compared to the experimental TLD results for X-rays effective energies (60)Co gamma radiation. In order to study the photon interaction in the matter, a cylindrical model of 1 cm(3) was used. The gamma radiation source was placed at 100 cm to the object; the source is considered as an isotropic source of (60)Co. The energy deposited into the cylindrical model was determined by the Monte Carlo N-particle (MCNPX) method. Measurements of the TL phosphors were obtained by irradiating the powder by gamma radiation. TL glow curve of CaSO(4):Dy after gamma irradiated at a 1 Gy of absorbed dose was then obtained.
Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine 68(4-5):967-9. · 1.09 Impact Factor
