MO-D-T-617-07: Measurements of Surface Dose for 6MV and 10 MV X-Ray Beams Using Micro-MOSFET and Comparisons to Monte Carlo Skin Dose Calculations

2005 ◽  
Vol 32 (6Part14) ◽  
pp. 2061-2061
Author(s):  
H Xiang ◽  
L Court ◽  
J Song ◽  
Y Lyatskaya ◽  
R Tishler ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Skin Dose ◽  
Surface Dose ◽  
Dose Calculations ◽  
X Ray

Microcomputer Monte Carlo electron transport codes for beta skin dose calculations

1991 ◽  
Vol 38 (3) ◽  
pp. 936-941 ◽  
Author(s):  
M. Chung ◽  
A.H. Foderaro ◽  
W.A. Jester ◽  
S.H. Levine
Keyword(s):  
Monte Carlo ◽  
Electron Transport ◽  
Skin Dose ◽  
Dose Calculations

Measurement of Entrance Skin Dose in Radiographic Examinations of Pediatric Patients

2021 ◽  
Vol 17 ◽  
Author(s):  
Yousif Abdallah
Keyword(s):  
Saudi Arabia ◽  
Radiation Dose ◽  
Pediatric Patients ◽  
Skin Dose ◽  
Trauma Patients ◽  
Surface Dose ◽  
X Ray ◽  
Entrance Surface Dose ◽  
Entrance Skin Dose ◽  
The Mean

Background: To measure the entrance skin dose in radiographic examinations of pediatric patients in King Khalid Hospital, Majmaah, Saudi Arabia Introduction: Children have been given special attention since they are often regarded as especially vulnerable to potential hazards. The pediatric population is more susceptible to radiation than the adult population for certain tumor types. Objective: The aim of this study is to determine the amount of Entrance Surface Dose (ESD) received by pediatric patients attending the emergency department. Method: Traumatic department registers for pediatric patients attending the King Khalid hospital (Majmaah, Saudi Arabia) between 1st February and 31st December 2018 were retrospectively studied for all diagnostic (plain radiographs examinations) imaging did on pediatric (<18 years old) trauma patients. The entrance surface dose was used to calculate the total radiation dose for each patient. One hundred and twenty patients encountered the inclusion criteria of the study, and their doses (chest, skull, and extremities) were assessed. Results: The mean of radiation exposure factors were 65.4 ± 7.9 (71.3 – 89.9) and 1.3 ± 0.2 (0.3–2.5) for X-ray tube potential (kVp) and current (mAs), respectively. The measured dose for pediatric patients were 0.10 ± 0.02 (0.09 – 0.37), 0.18 + 0.04 (0.06 -0.59) and 0.09 + 0.03 (0.03 -0.45) for chest, skull, and extremities, respectively. The mean Entrance surface dose received by trauma patients was 0.03-0.59 mGy. 51.7% (62 patients) of the patients received ≤ 0.25 mGy while around 48.3% (58 patients) received ≥ 0.26 mGy radiation dose from those examinations. Conclusion: Trauma patients attending to traumatic radiology department obtain substantial Entrance surface dose from chest, skull, and extremities imaging procedures within their initial assessment. The radiation exposure can also be lowered by optimizing each examination. Therefore more studies are recommended for this task. The results obtained can be used as the basis for local reference dosages for X-ray examinations.

Build-up and surface dose measurements on phantoms using micro-MOSFET in 6 and 10MV x-ray beams and comparisons with Monte Carlo calculations

2007 ◽  
Vol 34 (4) ◽  
pp. 1266-1273 ◽  
Author(s):  
Hong F. Xiang ◽  
Jun S. Song ◽  
David W. H. Chin ◽  
Robert A. Cormack ◽  
Roy B. Tishler ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Surface Dose ◽  
X Ray ◽  
Monte Carlo Calculations ◽  
Dose Measurements

Determination of Stoichiometry of GaAs Component in (Gaas)Ge Epitaxially Grown Thin Films by Electron Microprobe X-Ray Analysis

1990 ◽  
Vol 48 (2) ◽  
pp. 264-265
Author(s):  
D. R. Liu ◽  
S. S. Shinozaki ◽  
R. J. Baird
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Compound Semiconductors ◽  
Energy Dispersive Analysis ◽  
X Ray ◽  
Metastable Alloys ◽  
Lower Voltage

The epitaxially grown (GaAs)Ge thin film has been arousing much interest because it is one of metastable alloys of III-V compound semiconductors with germanium and a possible candidate in optoelectronic applications. It is important to be able to accurately determine the composition of the film, particularly whether or not the GaAs component is in stoichiometry, but x-ray energy dispersive analysis (EDS) cannot meet this need. The thickness of the film is usually about 0.5-1.5 μm. If Kα peaks are used for quantification, the accelerating voltage must be more than 10 kV in order for these peaks to be excited. Under this voltage, the generation depth of x-ray photons approaches 1 μm, as evidenced by a Monte Carlo simulation and actual x-ray intensity measurement as discussed below. If a lower voltage is used to reduce the generation depth, their L peaks have to be used. But these L peaks actually are merged as one big hump simply because the atomic numbers of these three elements are relatively small and close together, and the EDS energy resolution is limited.

Low-voltage EDS of magnesium ferrite Dendrites in a FEG-SEM

1996 ◽  
Vol 54 ◽  
pp. 478-479
Author(s):  
Matthew T. Johnson ◽  
Ian M. Anderson ◽  
Jim Bentley ◽  
C. Barry Carter
Keyword(s):  
Monte Carlo ◽  
Quantitative Analysis ◽  
Monte Carlo Simulations ◽  
Cross Section ◽  
Spatial Resolution ◽  
Low Voltage ◽  
Magnesium Ferrite ◽  
X Ray ◽  
Interaction Volume ◽  
Ferrite Spinel

Energy-dispersive X-ray spectrometry (EDS) performed at low (≤ 5 kV) accelerating voltages in the SEM has the potential for providing quantitative microanalytical information with a spatial resolution of ∼100 nm. In the present work, EDS analyses were performed on magnesium ferrite spinel [(MgxFe1−x)Fe2O4] dendrites embedded in a MgO matrix, as shown in Fig. 1. spatial resolution of X-ray microanalysis at conventional accelerating voltages is insufficient for the quantitative analysis of these dendrites, which have widths of the order of a few hundred nanometers, without deconvolution of contributions from the MgO matrix. However, Monte Carlo simulations indicate that the interaction volume for MgFe2O4 is ∼150 nm at 3 kV accelerating voltage and therefore sufficient to analyze the dendrites without matrix contributions.Single-crystal {001}-oriented MgO was reacted with hematite (Fe2O3) powder for 6 h at 1450°C in air and furnace cooled. The specimen was then cleaved to expose a clean cross-section suitable for microanalysis.

scholarly journals Effects of Hounsfield number conversion on CT based proton Monte Carlo dose calculations

2007 ◽  
Vol 34 (4) ◽  
pp. 1439-1449 ◽  
Author(s):  
Hongyu Jiang ◽  
Joao Seco ◽  
Harald Paganetti
Keyword(s):  
Monte Carlo ◽  
Dose Calculations
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