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1001 |
Investigation into the Dosimetric Effects of Abutting Multi-Leaf-Collimated Photon Fields with Extended Source-to-Surface Electron FieldsSTEEL, Jared Gary January 2007 (has links)
This thesis reports on the findings of an investigation into the dosimetry resulting from the abutment of en face 6 MeV electron and 6 MV photon beams as applied to the clinical challenge of radiation therapy treatments to head and neck cancer sites. Particular concern is given to the use of multi-leaf collimator (MLC) technology for photon beam definition when abutted to extended source-to-surface (SSD) electron beams. We made dosimetric comparison between MLC and Cerrobend® shielding for use in an abutment situation. The effects of extending the SSD of the electron beam were also assessed. We checked the ability of a Pinnacle3 v7.6 treatment planning system (TPS) to correctly model the dosimetry resulting from this extended electron beam SSD. Volumetric simulations of composite dosimetry resulting in water were conducted in MATLAB® for variations of surface abutment gap, and photon beam shielding type and angle. Visualization Toolkit (VTK) script was developed to visualise the resulting dosimetry. The effect of extending the SSD of the electron beam increases the beam penumbra significantly, exacerbating the challenge of matching this field to a photon beam edge. Furthermore, the TPS was shown to inaccurately model the electron beam penumbra for the extended SSD conditions. The employment of MLC shielding provides for some advantages over Cerrobend® in terms of overall composite hotspot volumes and coldspot magnitudes, though introduces detrimental dosimetric inhomogeneities in the underlying volume. Distinctly, no combination of abutment gap and shielding variables resulted in dosimetry in the range of 90% to 110% at the depth of dmax for the beam energies considered here. We provided tabulated data across these variables to outline the trade-offs present, and aid clinical decisions regarding this challenging dosimetric
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1002 |
The design and construction of the beam scintillation counter for CMSBell, Alan James January 2008 (has links)
This thesis presents the design qualification and construction of the Beam
Scintillator Counter (BSC) for the CMS Collaboration at CERN in 2007
- 2008. The BSC detector is designed to aid in the commissioning of the
Compact Muon Solenoid (CMS) during the first 2 years of operation and
provide technical triggering for beam halo and minimum-bias events. Using
plastic scintillator tiles mounted at both ends of CMS, it will detect minimum
ionizing particles through the low-to-mid luminosity phases of the Large
Hadron Collider (LHC) commissioning. During these early phases, the BSC
will provide probably the most interesting and widely used data of any of
the CMS sub-detectors and will be employed in the track based alignment
procedure of the central tracker and commissioning of the Forward Hadron
Calorimeter.
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1003 |
Composition, structure and properties of sputter deposited calcium phosphate thin filmsBoyd, Adrian January 2000 (has links)
No description available.
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1004 |
Thermoelectric properties of Si-based two dimensional structuresAgan, Sedat January 2000 (has links)
No description available.
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1005 |
Issues concerning the use of H and Sb surfactant in Si and Siâ†1â†-â†xGeâ†X MBELambert, Andrew David January 2000 (has links)
No description available.
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1006 |
Growth techniques and characterisation of Siâ†1â†-â†xGeâ†x heterostructures for pMOS applicationsGrasby, Timothy John January 2000 (has links)
No description available.
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1007 |
An investigation of some magnetic oxides grown by pulsed laser depositionSena, S. P. January 1998 (has links)
No description available.
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1008 |
Dynamics and Kinetics of Si/Siâ†(â†1-â†xâ†)Geâ†(â†xâ†) MBE studies by reflectance spectroscopyLees, Anna January 1998 (has links)
No description available.
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1009 |
Beam splitting mechanisms for a caesium atom interferometerGodun, Rachel M. January 2000 (has links)
No description available.
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1010 |
Design and development of a tantalum foil target for the production of high intensity radioactive beamsDensham, Christopher John January 2000 (has links)
No description available.
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