Dosimetry
Mostrando 13-24 de 181 artigos, teses e dissertações.
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13. Skin Doses on the Lens for Temporomandibular Joint Exam in Cone Beam Computed Tomography
ABSTRACT The aim of this study was to evaluate the kerma at the surface of the lens in TMJ CBCT and to derive the equivalent dose. An anthropomorphic phantom of the head and neck manufactured by Radiation Support Devices (model RS-230) was used. The dosimetric measurements were obtained by using fourteen thermoluminescent dosimetry (TLD) dosimeters (LiF: Mg,
Braz. arch. biol. technol.. Publicado em: 2015-12
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14. Low-intensity red and infrared laser effects at high fluences on Escherichia coli cultures
Semiconductor laser devices are readily available and practical radiation sources providing wavelength tenability and high monochromaticity. Low-intensity red and near-infrared lasers are considered safe for use in clinical applications. However, adverse effects can occur via free radical generation, and the biological effects of these lasers from unusually
Braz J Med Biol Res. Publicado em: 28/07/2015
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15. Accuracy of dose planning for prostate radiotherapy in the presence of metallic implants evaluated by electron spin resonance dosimetry
Radiotherapy is one of the main approaches to cure prostate cancer, and its success depends on the accuracy of dose planning. A complicating factor is the presence of a metallic prosthesis in the femur and pelvis, which is becoming more common in elderly populations. The goal of this work was to perform dose measurements to check the accuracy of radiotherapy
Braz J Med Biol Res. Publicado em: 26/05/2015
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16. A dose-response curve for biodosimetry from a 6 MV electron linear accelerator
Biological dosimetry (biodosimetry) is based on the investigation of radiation-induced biological effects (biomarkers), mainly dicentric chromosomes, in order to correlate them with radiation dose. To interpret the dicentric score in terms of absorbed dose, a calibration curve is needed. Each curve should be constructed with respect to basic physical paramet
Braz J Med Biol Res. Publicado em: 26/05/2015
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17. Reconstructive dosimetry for cutaneous radiation syndrome
According to the International Atomic Energy Agency (IAEA), a relatively significant number of radiological accidents have occurred in recent years mainly because of the practices referred to as potentially high-risk activities, such as radiotherapy, large irradiators and industrial radiography, especially in gammagraphy assays. In some instances, severe inj
Braz J Med Biol Res. Publicado em: 08/05/2015
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18. Analysis of monotherapy prostate brachytherapy in patients with prostate cancer. Initial PSA and Gleason are important for recurrence?
Purpose To evaluate the clinical outcome of a cohort of localized prostate cancer patients treate with 125-I permanent brachytherapy at the São José Hospital – CHLC, Lisbon. Materials and Methods A retrospective analysis was carried out on 429 patients with low and intermediate-risk of prostate adenocarcinoma, according to the recommendations of the EOR
Int. braz j urol.. Publicado em: 2015-04
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19. Recovery of α-Al2O3 from Ionizing Radiation Dosimetric Sensors
Corundum, sapphire or α-Al2O3 is an important technological material in many optical and electronic applications such as solid-state lasers, optical windows and, more recently, as a radiation detector. Landauer (Glenwood, IL, USA) accumulated large number of archived and stored Luxel™ dosemeters composed of Al2O3:C, which were subjected to a recovery proc
Mat. Res.. Publicado em: 2015-02
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20. The Compact Irradiator Modulus Designed for DNA Repair and Mutagenesis Studies in ISS Microgravity Environment Using UVA Emitted by Light-Emitting Diodes
ABSTRACT: This work presents the design and characteristics of a new compact ultraviolet (UV) irradiator used in a biological onboard space flight experiment. The experiment, called DRM, took place in the International Space Station research facility (ISS-13 expedition), during the Centenary Mission (Russian-Brazil) in March-April 2006. The DRM main objectiv
J. Aerosp. Technol. Manag.. Publicado em: 2014-09
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21. Verification of Response of Neutron Monitor for In-Flight Neutron Dosimetry
ABSTRACT: In this work, we present the results of verification of special neutron monitoring equipment for use in aircrew dosimetry inside aircraft. The equipment was precalibrated with conventional neutron sources in a National Standard Laboratory of the Institute for Radioprotection and Dosimetry (IRD, Brazil) and verified in a Cosmic Energy Reference Fiel
J. Aerosp. Technol. Manag.. Publicado em: 2013-09
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22. Electron dosimetry in irradiation processing with rad-hard diodes / Dosimetria de elétrons em processos de irradiação com diodos resistentes a danos de radiação
Este trabalho teve como objetivo o desenvolvimento de sistemas dosimétricos baseados em diodos especiais de Si, resistentes a danos de radiação, para monitoração online de processos de irradiação com elétrons de 1,5 MeV de energia e para dosimetria relativa e escaneamento de feixe de elétrons clínicos dentro de uma faixa de energia de 6 a 21 MeV. O
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/09/2012
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23. Análise dos procedimentos e critérios de implantação de feixes de raios X de referência ISO 4037 em baixas energias
According to the radiological protection principles, practices involving ionizing radiation must be planned and carried out under the guarantee that the values of individual doses, the number of people exposed to radiation and the probability of accidental exposures are as low as reasonably achievable. Therefore, radiation dosimetry is required to be done wi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/08/2012
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24. Desenvolvimento e estudo de materiais termoluminescentes baseados em óxido de alumínio para aplicação em dosimetria / Development and study of thermoluminescent materials based on aluminum oxide for dosimetry application
The aluminum oxide was one of the former compounds investigated with a view to detecting and measuring radiation by means of the thermoluminescence (TL). Commonly referred to as \"alumina\", aluminum oxide has interesting features for the development of materials for dosimetry. Its effective atomic number has an intermediate value between the bone and soft t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/04/2012