Electron beam energy monitoring using thermoluminescent dosimeters and electron back scattering |
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| Institution: | 1. Laboratorio de Física Médica & Unidad de Radioneurocirugía, Instituto Nacional de Neurología y Neurocirugía, Tlalpan, 14269 Mexico D.F., Mexico;2. Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada Unidad Legaria, Instituto Politécnico Nacional, Lindavista, 11500 Mexico D.F., Mexico;3. Instituto de Física, Universidad Nacional Autónoma de México, Ciudad Universitaria, Mexico City 04510, Mexico;1. Yerevan Physics Institute, Alikhanian Br. St. 2, Yerevan 0036, Armenia;2. Bergoz Instrumentation, 156 Rue du Mont Rond, 01630, France;3. Ulsan National Institute of Science and Technology, Ulsan 689-798, Republic of Korea;1. Programa de Pós Graduação do Centro de Desenvolvimento da Tecnologia Nuclear–CDTN/CNEN, Av. Pres. Antônio Carlos, 6627, 31270-901 Belo Horizonte, MG, Brazil;2. Departamento de Engenharia Nuclear – Programa de Pós Graduação em Ciências e Técnicas Nucleares, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, 6627, 31270-901 Belo Horizonte, MG, Brazil;1. Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Pôle Radioprotection de l''Homme, External Dosimetry Department, BP17, 92260 Fontenay-aux-Roses, France;2. Institut Curie – Centre de Protonthérapie d''Orsay (CPO), Campus Universitaire Bâtiment 101, 91898 Orsay, France |
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| Abstract: | Periodic checks of megavoltage electron beam quality are a fundamental requirement in ensuring accurate radiotherapy treatment delivery. In the present work, thermoluminescent dosimeters (TLDs) positioned on either side of a lead sheet at the surface of a water equivalent phantom were used to monitor electron beam quality using the electron backscattering method. TLD100 and TLD100H were evaluated as upstream detectors and TLD200, TLD400 and TLD500 were evaluated as downstream detectors. The evaluation assessed the test sensitivity and correlation, long and short term reproducibility, dose dependence and glow curve features. A prototype of an in-air jig suitable for use in postal TLD dose audits was also developed and an initial evaluation performed. The results indicate that the TLD100-TLD200 combination provides a sensitive and reproducible method to monitor electron beam quality. The light weight and easily fabricated in-air jig was found to produce acceptable results and has the potential to be used by radiation monitoring agencies to carry out TLD postal quality assurance audits, similar to audits presently being conducted for photon beams. |
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