A Novel Microdosimeter Based Upon Artificial Single Crystal Diamond

Rollet, S.; Angelone, M.; Magrin, Giulio; Marinelli, M.; Milani, E.; Pillon, M.; Prestopino, Giuseppe; Verona, C.; Verona-Rinati, G.

doi:10.1109/tns.2012.2209677

Cited by 20 publications

(12 citation statements)

References 27 publications

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“…Rollet [ 16 ] first reported the use of artificial diamond for microdosimeters. Diamond (Z = 6) offers advantages due to its radiation hardness and near tissue equivalence (Z = 7.5) for photon radiation, resulting in a less variable function for energy loss spectra conversion to water compared, for example, to silicon (Z = 14) [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Measurements of Dose and Microdosimetric Spectra in a Clinical Proton Beam Using a scCVD Diamond Membrane Microdosimeter

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Zahradnik

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et al. 2021

Sensors

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A single crystal chemical vapor deposition (scCVD) diamond membrane-based microdosimetric system was used to perform simultaneous measurements of dose profile and microdosimetric spectra with the Y1 proton passive scattering beamline of the Center of Proton Therapy, Institute Curie in Orsay, France. To qualify the performance of the set-up in clinical conditions of hadrontherapy, the dose, dose rate and energy loss pulse-height spectra in a diamond microdosimeter were recorded at multiple points along depth of a water-equivalent plastic phantom. The dose-mean lineal energy (y¯D) values were computed from experimental data and compared to silicon on insulator (SOI) microdosimeter literature results. In addition, the measured dose profile, pulse height spectra and y¯D values were benchmarked with a numerical simulation using TOPAS and Geant4 toolkits. These first clinical tests of a novel system confirm that diamond is a promising candidate for a tissue equivalent, radiation hard, high spatial resolution microdosimeter in beam quality assurance of proton therapy.

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Section: Introductionmentioning

confidence: 99%

Simultaneous Measurements of Dose and Microdosimetric Spectra in a Clinical Proton Beam Using a scCVD Diamond Membrane Microdosimeter

Loto

Zahradnik

Leite

et al. 2021

Sensors

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“…Among other solid state detectors, microdosimeters based on chemical vapor deposition (CVD) singlecrystal diamond have been recently proposed and previously tested with alpha-particles and neutron radiation. 8 The prototypes are based on a layered p-type highly doped diamond/ nominally intrinsic diamond/Schottky contact configuration. 9 The adopted structure allows to obtain very thin active volumes and to work without bias applied voltage.…”

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confidence: 99%

Spectroscopic properties and radiation damage investigation of a diamond based Schottky diode for ion-beam therapy microdosimetry

Verona

Magrin

Solevi

et al. 2015

Journal of Applied Physics

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In this work, a detailed analysis of the properties of a novel microdosimeter based on a synthetic single crystal diamond is reported. Focused ion microbeams were used to investigate the device spectropscopic properties as well as the induced radiation damage effects. A diamond based Schottky diode was fabricated by chemical vapor deposition with a very thin detecting region, about 400 nm thick (approximately 1.4 μm water equivalent thickness), corresponding to the typical size in microdosimetric measurements. A 200 × 200 μm2 square metallic contact was patterned on the diamond surface by standard photolithography to define the sensitive area. Experimental measurements were carried out at the Ruder Boškovic′ Institute microbeam facility using 4 MeV carbon and 5 MeV silicon ions. Ion beam induced charge maps were employed to characterize the microdosimeter response in terms of its charge collection properties. A stable response with no evidence of polarization or memory effects was observed up to the maximum investigated ion beam flux of about 1.7 × 109 ions·cm−2·s−1. A homogeneity of the response about 6% was found over the sensitive region with a well-defined confinement of the response within the active area. Tests of the radiation damage effect were performed by selectively irradiating small areas of the device with different ion fluences, up to about 1012 ions/cm2. An exponential decrease of the charge collection efficiency was observed with a characteristic decay constant of about 4.8 MGy and 1 MGy for C and Si ions, respectively. The experimental data were analyzed by means of GEANT4 Monte Carlo simulations. A direct correlation between the diamond damaging effect and the Non Ionizing Energy Loss (NIEL) fraction was found. In particular, an exponential decay of the charge collection efficiency with an exponential decay as a function of NIEL is observed, with a characteristic constant of about 9.3 kGy-NIEL for both carbon and silicon ions.

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“…To this purpose, synthetic single crystal diamond diodes developed at Rome "Tor Vergata" University laboratories and commercialized by PTW-Freiburg as microDiamond type 60019, show very good dosimetric properties for clinical high-energy proton and carbon radiation therapy beam dosimetry. [14][15][16][17] Recently, microdosimeters, based on a similar architecture of microDiamond, featured with very small dimension, good spectroscopic properties and high radiation tolerance have been also proposed [18][19][20] in the framework of a collaboration between "Tor Vergata" University and EBG MedAustron. In addition, diamond microdosimeters based on different architectures have been also developed and investigated by other research groups.…”

Section: Introductionmentioning

confidence: 99%

Microdosimetric characterization of clinical carbon‐ion beams using synthetic diamond detectors and spectral conversion methods

et al. 2019

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Purpose To investigate for the first time the potentialities of obtaining microdosimetric measurements in scanned clinical carbon‐ion beams using synthetic single crystal diamond detector and to verify the spectral conversion methods. Methods Microdosimetric measurements were performed at different depths in a water phantom at the therapeutic scanned carbon‐ion beam of the National Center of Oncological Hadrontherapy (CNAO) in Pavia, using waterproof encapsulated diamond microdosimeter developed at “Tor Vergata” University. A monoenergetic carbon‐ion beam of 195 MeV/μ scanned over a square field of 2 × 2 cm2 was used. Experimental microdosimetric spectra were compared with those obtained with a propane‐filled Tissue Equivalent Proportional Counters (TEPCs) microdosimeter in the same facility at the same conditions. To this purpose, the spectra in diamond were converted to the spectra that would have been collected with a propane‐filled cylindrical sensitive volume by means of a novel analytic methodology, recently developed at MedAustron. Results The microdosimetric spectra acquired by the diamond microdosimeter show different shapes in the 10 keV µm−1 ÷ 103 keV µm−1 lineal‐energy range at different water depths. In spite of the high counting rate, no spectral distortion, due to pile‐up events and polarization effects, were observed. The experimental spectra have a low detection threshold of about 6 keV µm−1 due to the electronic noise in the irradiation room. The comparison between the spectra converted to propane from diamond detector and the spectra collected directly with propane‐filled TEPC shows a good agreement in the whole lineal‐energy range. Furthermore this comparison confirms that diamond detector response is LET independent. The frequency‐ and dose‐mean lineal energy values were also assessed for all spectra. The frequency‐mean values obtained with diamond microdosimeter at different depths scales rather well with the absorbed dose values. Conclusions Microdosimetric characterization of a synthetic single crystal diamond detector in high‐energy scanned carbon‐ion beams was performed. The results of the present study showed that this detector is suitable for microdosimetry of clinical carbon ion beams. In addition, the good agreement between the converted diamond spectra and those obtained with TEPC provides the first experimental validation of the spectra conversion methodologies as valuable tools for the comparison of spectra collected with different detectors.

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A Novel Microdosimeter Based Upon Artificial Single Crystal Diamond

Cited by 20 publications

References 27 publications

Simultaneous Measurements of Dose and Microdosimetric Spectra in a Clinical Proton Beam Using a scCVD Diamond Membrane Microdosimeter

Simultaneous Measurements of Dose and Microdosimetric Spectra in a Clinical Proton Beam Using a scCVD Diamond Membrane Microdosimeter

Spectroscopic properties and radiation damage investigation of a diamond based Schottky diode for ion-beam therapy microdosimetry

Microdosimetric characterization of clinical carbon‐ion beams using synthetic diamond detectors and spectral conversion methods

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