Skin collimation in electron therapy ensures sharper penumbra and maximal protection to adjacent critical structures. It also provides a better clinical dose to the target and avoids recurrences at the periphery. The thickness of the electron skin collimation must be adequate for shielding purposes, not too thick to cause discomfort to the patient and be conformal to the skin. This study assessed the clinical potential of machined brass skin collimation with variable thickness. Brass transmission factors for 6, 9, and 12 MeV electron beams were measured and used to determine the skin collimation clinically acceptable thickness. Dosimetric performance of the variable thickness skin collimation was evaluated for 9 MeV electrons within a rectilinear water-equivalent phantom and a water-filled head phantom. Results showed the variable thickness skin collimation is dosimetrically equivalent to the uniform thickness collimation. Favorable dosimetric advantages for brass skin collimation for small electron fields were achieved. / Includes bibliography. / Thesis (PMS)--Florida Atlantic University, 2021. / FAU Electronic Theses and Dissertations Collection

Thesis (Ph. D.)--University of Washington, 1997. / Vita. Includes bibliographical references (leaves [80]-84).

Thesis (M.S. in Physics)--Naval Postgraduate School, December 1990. / Thesis Advisor(s): Colson, William B. Second Reader: Burkirk, Fred Ramon. "December 1990." Description based on title screen as viewed on April 02, 2010. DTIC Descriptor(s): Input, coils, magnetic fields, models, theses, electrons, electron beams, free electron lasers, integration, tolerance, focusing, matching, trajectories, field equipment, winding, control DTIC Identifier(s): Electron trajectories, helical undulators, magnetic fields, theses. Author(s) subject terms: Includes bibliographical references (p. 76). Also available in print.

Thesis (M.S.)--Oregon State University, 2010. / Printout. Includes bibliographical references (leaves 42-45). Also available on the World Wide Web.

Thesis (Ph. D.)--Oregon Graduate Center, 1984.

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

Made available in DSpace on 2014-10-09T12:37:22Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:09:16Z (GMT). No. of bitstreams: 1 02037.pdf: 3257325 bytes, checksum: 6f7184b35c6dddcd40410864962f58fe (MD5) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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 / A avaliação do desempenho dos detectores termoluminescentes de CaSO4:Dy, produzidos pelo IPEN, tem como objetivo apresentar uma alternativa aos dosímetros de LiF:Mg,Ti comerciais (TLD-100), amplamente empregados em radioterapia, na dosimetria de feixes clínicos de elétrons. Os dois tipos de detectores termoluminescentes foram caracterizados, com a utilização de objetos simuladores de PMMA, água sólida do tipo RMI-457 e água, em campos de radiação de elétrons de 4, 6, 9, 12 e 16 MeV de energias nominais, nos quais as curvas de dose-resposta foram obtidas e as doses superficial e profunda foram determinadas. A dependência da resposta termoluminescente com a energia nominal dos elétrons e com o objeto simulador empregado foram estudadas. O CaSO4:Dy apresentou o mesmo comportamento do LiF:Mg,Ti; de maneira que sua aplicação como uma alternativa às pastilhas TLD-100 na dosimetria de feixes de elétrons em radioterapia é viável e apresenta a sensibilidade à radiação de elétrons significativamente mais alta como principal vantagem. / Dissertação (Mestrado) / IPEN/D / Instituto de Pesquisas Energéticas e Nucleares - IPEN/CNEN-SP

Made available in DSpace on 2014-10-09T12:37:22Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:09:16Z (GMT). No. of bitstreams: 1 02037.pdf: 3257325 bytes, checksum: 6f7184b35c6dddcd40410864962f58fe (MD5) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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