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Showing 1 to 18 of 18 for “"Kerma"”.
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Behavioral Reconstruction of the Kerma Era Nubians
… of three contemporaneous Nubian groups of the Kerma era (2,500-1,500BC) in ancient Nubia. The skeletal samples used here are from three contemporaneous ancient Nubian groups who lived during this period. The Kerma Collection represents a population from the urban capital city of Kerma in Upper …
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Metrologia dei campi di radiazioni di bassa energia
The conversion coefficients from air kerma to ICRU operational dose equivalent quantities for ENEA’s realization of the X-radiation qualities L10-L35 of the ISO “Low Air Kerma rate” series (L), N10-N40 of the ISO “Narrow spectrum” series (N) and H10-H60 of the ISO “High Air-kerma rate” (H) series …
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Calculations of neutron damage cross-sections in silicon, gallium arsenide and iron
… been modified to calculate total displacements kerma cross-sections for silicon, gallium, arsenic and gallium arsenide. The modified NJOY is also used to calculate the displacement cross-sections for iron.
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Dosimetric characterization of a miniature x-ray source for biophysics studies
… and parameters including beam dimensions, air-kerma and dose to tissue values from the Mini-X were explored. Lastly, a cross calibration curve between an optically stimulated luminescent dosimeter (nanoDots) and A-20 ionization chamber was established, with an aim to use nanoDots for a proposed …
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Development of a method for automating effective patient diameter estimation for digital radiography
… energy photon basis. Values of initial air kerma are estimated from the examination exposure factors and measurements made on the x-ray system. Values of kerma at the image receptor are estimated from a measurement of pixel value made at the centre of the radiograph and the measured …
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Sistema dosimétrico microcontrolado, baseado em detectores semicondutores, para análise de desempenho de equipamentos mamográficos
… medir simultaneamente o tempo de irradiação, o kerma no ar incidente na pele e o valor da tensão aplicada ao tubo de raios-X. Ele consiste de um conjunto de três sensores semicondutores conectados no modo fotovoltaico à entrada de eletrômetros integradores especialmente construídos. Um desses …
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The Agricultural Transition in Upper Nubia: An Analysis of Mandibular Morphology and Oral Health
… Nubia (Sudanese Neolithic c. 5000–4000 cal BC, Kerma Ancien c. 2500–2050 BC, Kerma Classique c. 1750–1500 BC and Meroitic c. 350 BC–AD 350). Mandibular osteometrics and cross-sectional geometric properties were calculated from 3D laser scanned models to explore the relationship between …
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An Absorbed Dose to Water Primary Standard for Ir-192 Brachytherapy
… of 0.7 % was achieved, in agreement with NRC air-kerma based standards at the 2σ level.
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Evaluation of Presage® Dosimeters For Brachytherapy Sources and The 3D Dosimetry and Characterization of The New Agx100 125I Seed Model
… software. An Amersham 6711 seed with an air-kerma strength of approximately 9 U was used to irradiate two dosimeters to 2 Gy and 11 Gy at 1 cm to evaluate dose rates in the r=1 cm to r=5 cm region. The dosimetry parameters were compared to the values published in the updated AAPM Report No. …
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Egyptian imperialism in Nubia c. 2009 – 1191 BC
… with data from new excavations in Nubia at Kerma and the New Kingdom „temple towns‟ have all contributed to this research. From this study it can be seen that Egyptian presence in Nubia continued, without break, from the Middle Kingdom conquest through to the end of the New Kingdom. The …
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Estimativa da dose em pacientes adultos submetidos a exames de tórax e abdômen em tomografia computadorizada no Brasil
… parâmetros de aquisição, índice volumétrico de kerma ar (Cvol) e produto do kerma ar pelo comprimento de varredura (PKL), resultantes de exames de abdômen e tórax realizados em adultos . A parceria com a empresa GE possibilitou a aquisição dos dados através do acesso remoto aos equipamentos …
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Characterization of The New Xoft Axxent Electronic Brachytherapy Source Using Presage(Tm)
… software. A Xoft source with a measured air kerma strength of 126095 U was used in this experiment to irradiate 8 PRESAGE dosimeters to 15 Gy at 1 cm in order to evaluate the dose rates from r=1 cm to r=5 cm. The dosimetric parameters were calculated and compared to the Rivard et al. (<a …
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Kindergarten handbook for parents of Palmetto Elementary School
The handbook tells about the characteristics of a five-year-old child, work and play in kindergarten, and when we respond to the environment. The handbook shares suggestions that will enable parents to understand the purpose and programs of the school and to promote understanding and enthusiasm for …
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Investigation of the barium enema x-ray examination as a significant contributor to the genetically-significant dose from diagnostic radiology
… study) compared to 16111 μGy x 10⁻¹ (Maree). Air-kerma at skin entrance was calculated using dose-area product measurements, recorded during the present study, for individual exposures and screening. These values were used to calculate the gonad dose. A discrepancy was demonstrated between the …
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A new standard in testing mattresses for use in x-ray imaging : developing, validating and using a novel method to test x-ray mattresses for pressure ulcer development, radiation dosimetry and image quality
… attenuation were also assessed. Incident air kerma (IAK) was measured, with and without mattress, over a range of exposure factors using a digital dosimeter. Inverse image Quality Factor (IQFinv) was calculated to assess image quality using a commercially available phantom (CDRAD). Results The …
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Radiation Dose Estimation for Pediatric Patients Undergoing Cardiac Catheterization
… the two standard system output indices, the Air Kerma (AK) and Dose-Area Product (DAP), were also recorded and compared to the measured cardiac and skin doses – the lack of correlation between the indices and the organ doses shed light to the substantial limitation of the indices in representing …
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Protección radiológica en radioterapia intraoperatoria mediante un acelerador portátil de electrones.
… debida a fotones y electrones y un mapa del kerma debido a fotones. De este modo, el usuario con la información de los materiales que componen las barreras estructurales del quirófano en su instalación y con sus dimensiones aproximadas, podrá estimar la atenuación producida en cada una de las …
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A Study of Newtron Irradiation Effects on Gallium Arsenide Semiconductor Materials
Made available in DSpace on 2017-07-06T18:59:35Z (GMT). No. of bitstreams: 3 Yang_Siyuan_MS.pdf: 40469799 bytes, checksum: 1b8400059c7276e82d663b03f596a858 (MD5) Yang_Siyuan_MS_ABS.pdf: 573254 bytes, checksum: 6d52f1d60dcb222b600aa29c8bbb880d (MD5) license.txt: 4813 bytes, checksum: …