Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"radiation dosimetry"”.
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Radiation Dosimetry in the Presence of Gold Nanoparticles
… nanoparticles (GNPs) to enhance the dose due to radiation, through increased photoelectric effect interactions, has shown promise in vivo and in vitro. Monte Carlo studies have worked towards quantifying the dose enhancement and the dosimetry surrounding GNPs. This thesis investigates the …
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Point-based Ionizing Radiation Dosimetry Using Radiochromic Materials and a Fibreoptic Readout System
… for applicability in real-time in vivo dosimetry of ionizing radiation. Both films were able to produce a real-time measurement of optical density from a small volume, allowing positioning onto a tip of an optical fibre in the future. The increase in optical density was linear with …
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Gamma irradiation response of photonic crystal and standard optical fibre Bragg grating sensors for radiation dosimetry
… Fibre Bragg Grating Sensors (FBGs) for Gamma Radiation Dosimetry. A comparative analysis of responses to gamma irradiation between standard commercial FBGs and new generation FBGs written in Photonic Crystal fibre (PCF) were examined under similar regimes and conditions. Current research …
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The Design, Synthesis and Characterization of Lanthanide-based Nanomaterials and Their Use in 3D Biological Imaging and Radiation Dosimetry
… (3) the application of scintillating nanoscale radiation detection materials as an alternative to the single-crystal bulk lanthanide doped materials and plastic scintillators currently employed.</p><p>In many proposed applications of upconverting nanomaterials, the relative intensities of …
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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
… low X-ray attenuation properties to minimise radiation dose to the patient. Mattresses should create no artifacts within the X-ray image, as this may compromise image quality and diagnosis. Finally, mattresses should be constructed in such a way that interface pressure (IP) is minimized, …
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Radiation Dose Estimation for Pediatric Patients Undergoing Cardiac Catheterization
… catheterization are potentially at risk of radiation-induced health effects from the interventional fluoroscopic X-ray imaging used throughout the clinical procedure. The amount of radiation exposure is highly dependent on the complexity of the procedure and the level of optimization in …
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HIGH FIELD MAGNETIC RESONANCE IMAGING-BASED GEL DOSIMETRY FOR SMALL RADIATION FIELDS
Small megavoltage photon radiation fields (< 3cm diameter) are used in advanced radiation therapy techniques, such as intensity modulated radiotherapy, and stereotactic radiosurgery, as well as for cellular and preclinical radiobiology studies (very small fields, <1 mm diameter). Radiation dose …
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Improved mehtods and reagents for pretargeted radioimmunotherapy of cancer
… diffusion and catabolism in tumor spheroids, and radiation dosimetry models for alpha- and beta-emitting radionuclides. This model demonstrated that it is theoretically possible to kill every cell in 100 tm radius micrometastases using 9Y- or 213Bi-based PRIT with acceptable toxicity as described. …
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Instrument and Application Development in Saturation Recovery and Rapid Scan Electron Paramagnetic Resonance
… samples. For example, irradiated fingernails for radiation dosimetry have been studied using RS-EPR, which resulted in substantial decreases in detection limits. Samarium-mediated reduction mechanisms in organic synthesis have been investigated by RS-EPR providing evidence for a radical …
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Real-Time Radiation Detection within the Gastrointestinal Tract
The risk of a radiation emergency is becoming more prevalent as the misuse of nuclear facilities or technologies by terrorists or rogue nation-states continues to increase. A radiation emergency could cause instantaneous and sustained large releases of penetrating radiation, which would result in …
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Investigation and use of dual (twin) low pressure proportional counters for active neutron-gamma mixed field dosimetry
… tackles accurate neutron-gamma mixed field dosimetry in radiation protection and radiation biology. While passive dosimeters are suitable for measuring low radiation levels, active instruments are necessary in high radiation environments, such as found in nuclear power plants and particle …
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Transit Dosimetry for Patient Treatment Verification with an Electronic Portal Imaging Device
… patterns constructed during intensity modulated radiation therapy (IMRT) treatment planning must be verified before they are delivered to the patient. There is a compelling argument for additional verification throughout the course of treatment due to the possibility of data corruption, …
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Carbon Nanotube Based Dosimetry of Neutron and Gamma Radiation
… 20 years, accurate information regarding neutron radiation exposure is more important than ever. Structural components such as the reactor pressure vessel (RPV) become embrittled by neutron irradiation, reducing their capability to resist crack growth and increasing the risk of catastrophic …
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Quality Assurance of Advanced Treatment Modalities Using Presage® Dosimeters
… is able to provide a complete 3D measured dosimetry dataset with one treatment plan delivery. It was hypothesized that a PRESAGE<sup>® </sup>dosimeter would agree with 2D measurements within ±5%/3mm using a gamma index analysis. The PRESAGE<sup>®</sup> dosimeter will detect dose …
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Development of A Remote Dosimetric Audit Framework For Carbon Therapy
… radioresistant tumors. While ion chamber dosimetry has been used for day-to-day clinical measurements of absorbed dose, there are few options for remote dosimetry. The availability of such tools would support the development of a robust remote audit program for carbon ion therapy.</p> …
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Neutron production in a spherical phantom aboard the international space station
… of devices from passive and active dosimeters to radiation environment monitors have been used to measure radiation levels onboard different space crafts and shuttles allowing the space community to identify and quantify space radiation. The recent construction of several laboratories on the …
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Establishment of the Physical and Technical Prerequisites for the Determination of the Relative Biological Effectiveness of Low-energy Monochromatic X-rays
… whereas, in radiotherapy, they are used for irradiation of superficial tumours, in brachytherapy and photon activation therapy. The importance of soft X-rays for fundamental radiobiological research is based on the fact, that all species of ionizing radiation produce a wide spectrum of …