title: Measurement of carbon ion microdosimetric distributions with ultrathin 3D silicon diodes.
abstract: The commissioning of an ion beam for hadrontherapy requires the evaluation of the biologically weighted effective dose that results from the microdosimetric properties of the therapy beam. The spectra of the energy imparted at cellular and sub-cellular scales are fundamental to the determination of the biological effect of the beam. These magnitudes are related to the microdosimetric distributions of the ion beam at different points along the beam path. This work is dedicated to the measurement of microdosimetric spectra at several depths in the central axis of a (12)C beam with an energy of 94.98 AMeV using a novel 3D ultrathin silicon diode detector. Data is compared with Monte Carlo calculations providing an excellent agreement (deviations are less than 2% for the most probable lineal energy value) up to the Bragg peak. The results show the feasibility to determine with high precision the lineal energy transfer spectrum of a hadrontherapy beam with these silicon devices.
authors.affiliation: Departamento de Física de Partículas, Universidad de Santiago, 15782-Santiago de Compostela, Spain. Grupo de Imagen Molecular, Instituto de Investigación Sanitaria, 15706-Santiago de Compostela, Spain.
authors.forename: F
authors.initials: F
authors.lastname: Gómez
authors.forename: C
authors.initials: C
authors.lastname: Fleta
authors.forename: S
authors.initials: S
authors.lastname: Esteban
authors.forename: D
authors.initials: D
authors.lastname: Quirion
authors.forename: G
authors.initials: G
authors.lastname: Pellegrini
authors.forename: M
authors.initials: M
authors.lastname: Lozano
authors.forename: Y
authors.initials: Y
authors.lastname: Prezado
authors.forename: M
authors.initials: M
authors.lastname: Dos Santos
authors.forename: C
authors.initials: C
authors.lastname: Guardiola
authors.forename: G
authors.initials: G
authors.lastname: Montarou
authors.forename: J
authors.initials: J
authors.lastname: Prieto-Pena
authors.forename: Juan
authors.initials: J
authors.lastname: Pardo-Montero
mesh_terms: D063193:Heavy Ion Radiotherapy / Q000295:instrumentation*; D006801:Humans; D018499:Linear Energy Transfer; D009010:Monte Carlo Method; D011522:Protons; D011874:Radiometry / Q000295:instrumentation*; D012825:Silicon
chemical_list: D011522:Protons; D012825:Silicon