• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 392
  • 294
  • 54
  • 42
  • 14
  • 10
  • 6
  • 5
  • 4
  • 4
  • 3
  • 3
  • 3
  • 3
  • 3
  • Tagged with
  • 1239
  • 674
  • 381
  • 234
  • 155
  • 154
  • 152
  • 152
  • 116
  • 103
  • 102
  • 100
  • 92
  • 92
  • 90
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
91

An angular dependent neutron effective-dose-equivalent dosimeter

Veinot, Kenneth Guy 12 1900 (has links)
No description available.
92

High Resolution Polymer Gel Dosimetry for Small and Micro Field Dosimetry, and Development of Innovative Polymer Gel Dosimeters

Wong, Christopher James, chrisjwong@yahoo.com.au January 2009 (has links)
Current radiotherapy techniques are focused on delivering effective treatments while sparing surrounding healthy tissues. As a result, radiotherapy treatments are using narrower and more tightly conforming therapy techniques. For these treatments to be effective an accurate measure of the dose delivered by these very narrow radiotherapy beams, both in and around the target volume, is required. It is a challenging task for the conventional type dosimeters to determine dose distribution in such small fields. The best example of such fields is microbeam beam radiotherapy (MRT), a developing treatment technique that takes this requirement even further. MRT delivers an array of micrometre size radiotherapy beams to the target. MRT has been shown to be highly effective, but reliable dosimetry of MRT is challenging due to the micrometre scales involved. Attempts to determine the MRT dose distribution have been documented for using special type dosimeters such as radioch romic film and MOSFET detectors, as well as Monte Carlo simulations. This thesis investigates polymer gels as a dosimeter for dose distribution measurements of small radiotherapy fields and microbeams. Polymer gel dosimetry is a technique which uses a tissue-equivalent gel to act as both a three-dimensional dosimeter and a phantom at the same time. These gels polymerise when exposed to ionising radiation and the response is locally dose dependent linearly. This thesis investigates the use of polymer gels for the dosimetry of small sub-centimetre (down to 3 × 3 mm2) and micrometre radiotherapy fields. A high resolution imaging technique is also required for such small beam dosimetry. This work used special high strength MRI scanners to analyse polymer gels at high resolution. This work explores the feasibility of polymer gels irradiated by microbeams and analysed using Raman spectroscopy as a dosimeter for synchrotron generated microbeams. MRT is characterised by very high doses, and special high-dose resistive types of gel were developed as part of this work. It is shown that polymer gels imagined using Raman spectroscopy techniques are capable of measuring the dose distribution of microbeam radiation techniques. This thesis also investigates the use of polymer gels to measure dose perturbations caused by metallic artefacts. Metallic artefacts, such as a surgical aneurysm clip, can be left in a patient and cause dose perturbations during radiotherapy procedures. Polymer gels were used to determine the degree of dose enhancement induced by an aneurysm clip placed inside when irradiated with a typical stereotactic radiotherapy procedure. In addition, this thesis used gels in several other innovative applications. Photonuclear interactions generated in gel by high energy x-ray beams were measured via secondary neutrons. Special clear-type gels that do not change colour with irradiation were developed. Polymer gels were investigated for dosimetry of an extremely high dose rate capacitor type linear accelerator. And polymer gels were for measurement of a high energy proton beam.
93

Breast cancer tomotherapy: the impact of intrafraction motion and shallow depth dose profiles on the choice of PTV depth /

Strydhorst, Jared H. January 1900 (has links)
Thesis (M.Sc.) - Carleton University, 2008. / Includes bibliographical references (p. 93-99). Also available in electronic format on the Internet.
94

An investigation into the Penumbral dose of a Bloxel, (Block Element) matrix-design block to replace currently utilized radiation treatment field shaping techniques /

Ciccone, Theresa. January 1984 (has links)
Thesis (B.S.)--Rochester Institute of Technology, 1984. / Typescript. Includes bibliographical references (leaves 35-38).
95

Measurement of absorbed dose for paediatric patients for the purpose of developing dose guidelines in paediatric radiology /

Swart, Gillian. January 1900 (has links)
Thesis (MTech (Radiography))--Peninsula Technikon, 2004. / Word processed copy. Summary in English. Includes bibliographical references (leaves 101-104). Also available online.
96

Skin dose measurement for interventional cardiology : a thesis submitted in partial fulfilment of the requirements for the degree of Master of Science in Medical Physics, University of Canterbury /

Blair, Andrew W. January 2009 (has links)
Thesis (M. Sc.)--University of Canterbury, 2009. / Typescript (photocopy). Includes bibliographical references (p. 85-90). Also available via the World Wide Web.
97

Analytical methods for near field radio frequency dosimetry for tissue layers and celluar structures

Kurniawan, Teddy. January 2009 (has links)
Thesis (PhD) - Faculty of Life and Social Sciences, Swinburne University of Technology, 2009. / A thesis submitted in total fulfillment of the requirements for the degree of Doctor of Philosophy, Faculty of Life and Social Science, Swinburne University of Technology - 2009. Typescript. Includes bibliographical references.
98

Desenvolvimento de um monitor de area para neutrons utilizando detector solido de tracos nucleares

ZAHN, GUILHERME S. 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:38:02Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:04:38Z (GMT). No. of bitstreams: 1 05578.pdf: 1277201 bytes, checksum: 2ef4d6038f2cce475891ed87d5a589ad (MD5) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
99

Avaliação do desempenho dos detectores termoluminescentes de CaSOsub(4):Dy e LiF:Mg, Ti na dosimetria de feixes clínicos de elétrons / Assessment of CaSO4:Dy and LiF:Mg, Ti thermoluminescent dosimeters performance in the dosimetry of clinical electron beam

NUNES, MAIRA G. 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:54:23Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:07:45Z (GMT). No. of bitstreams: 0 / Dissertação (Mestrado) / IPEN/D / Instituto de Pesquisas Energéticas e Nucleares - IPEN/CNEN-SP
100

Dosimetria termoluminescente de neutrons com fluorita natural

MUCCILLO, REGINALDO 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:24:00Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:07:54Z (GMT). No. of bitstreams: 1 01009.pdf: 1210828 bytes, checksum: 081f4bbe930a4a873ba638585746e8b9 (MD5) / Dissertacao (Mestrado) / IEA/D / Instituto de Fisica, Universidade de Sao Paulo - IF/USP

Page generated in 0.0273 seconds