Dosimetric characteristics of four PTW microDiamond detectors in high-energy proton beams

Autor: Michal Pomorski, Catherine Nauraye, L. De Marzi, F. Moignau, C. Moignier, F Marsolat, Sophie Heinrich, Alejandro Mazal, Dominique Tromson, Annalisa Patriarca
Přispěvatelé: Institut Curie [Paris], Laboratoire Modélisation et Simulation de Systèmes (LM2S), Département Métrologie Instrumentation & Information (DM2I), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire Capteurs Diamant (LCD-LIST), Laboratoire National Henri Becquerel (LNHB), Laboratoire Capteurs et Architectures Electroniques (LCAE), ITMO Cancer within the framework of 'Plan Cancer 2014-2019' and 'DEDIPRO' project, Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Département d'instrumentation Numérique (DIN (CEA-LIST)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)
Jazyk: angličtina
Rok vydání: 2016
Předmět:
Materials science
Dose profile
Linear energy transfer
[SDV.IB.MN]Life Sciences [q-bio]/Bioengineering/Nuclear medicine
Particle detector
030218 nuclear medicine & medical imaging
03 medical and health sciences
POLYMER GEL
0302 clinical medicine
Nuclear magnetic resonance
Optics
DEPENDENCE
DOSE MEASUREMENTS
Proton Therapy
Dosimetry
Radiology
Nuclear Medicine and imaging
Linear Energy Transfer
[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]
[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics
Radiometry
SILICON
Proton therapy
Reproducibility
Dosimeter
Radiological and Ultrasound Technology
dosimetry
business.industry
Radiation Dosimeters
THERAPY CENTER
TUMORS
PHOTON BEAMS
030220 oncology & carcinogenesis
Ionization chamber
Diamond
business
diamond detector
proton
SINGLE-CRYSTAL DIAMOND
RADIOTHERAPY
Zdroj: Physics in Medicine and Biology
Physics in Medicine and Biology, IOP Publishing, 2016, 61 (17), pp.6413-6429. ⟨10.1088/0031-9155/61/17/6413⟩
Physics in Medicine and Biology, 2016, 61 (17), pp.6413-6429. ⟨10.1088/0031-9155/61/17/6413⟩
ISSN: 0031-9155
1361-6560
DOI: 10.1088/0031-9155/61/17/6413⟩
Popis: International audience; Small diamond detectors are useful for the dosimetry of high-energy proton beams. However, linear energy transfer (LET) dependence has been observed in the literature with such solid state detectors. A novel synthetic diamond detector has recently become commercially available from the manufacturer PTW-Freiburg (PTW microDiamond type 60019). This study was designed to thoroughly characterize four microDiamond detectors in clinical proton beams, in order to investigate their response and their reproducibility in high LET regions. Very good dosimetric characteristics were observed for two of them, with good stability of their response (deviation less than 0.4% after a pre-irradiation dose of approximately 12 Gy), good repeatability (coefficient of variation of 0.06%) and a sensitivity of approximately 0.85 nC Gy(-1). A negligible dose rate dependence was also observed for these two microDiamonds with a deviation of the sensitivity less than 0.7% with respect to the one measured at the reference dose rate of 2.17 Gy min(-1), in the investigated dose rate range from 1.01 Gy min(-1) to 5.52 Gy min(-1). Lateral dose profile measurements showed the high spatial resolution of the microDiamond oriented with its stem perpendicular to the beam axis and with its small sensitive thickness of about 1 mu m in the scanning profile direction. Finally, no significant LET dependence was found with these two diamond dosimeters in comparison to a reference ionization chamber (model IBA PPC05). These good results were in accordance to the literature. However, this study showed also a non reproducibility between the devices in terms of stability, sensitivity and LET dependence, since the two other microDiamonds characterized in this work showed different dosimetric characteristics making them not suitable for proton beam dosimetry with a maximum difference of the peak-to-plateau ratio of 6.7% relative to the reference ionization chamber in a clinical 138 MeV proton beam.
Databáze: OpenAIRE
Externí odkaz: