First dose-map measured with a polycrystalline diamond 2D dosimeter under an intensity modulated radiotherapy beam

Scaringella, M.; Zani, M.; Baldi, Andrea; Bucciolini, M.; Pace, E.; Sio, A. De; Talamonti, Cinzia; Bruzzi, M.

doi:10.1016/j.nima.2015.03.023

Cited by 7 publications

(5 citation statements)

References 6 publications

(6 reference statements)

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“…The sensitivity of the SSCD-Pro is energy and dose rate independent (Moignier et al 2017). Another group has investigated a 2D polycrystalline diamond based on CVD (Scaringella et al 2015, Bartoli et al 2017. That diamond has dimensions of 2.5 × 2.5 cm 2 , with a thickness of 300 µm.…”

Section: Synthetic Diamondsmentioning

confidence: 99%

Semiconductor dosimetry in modern external-beam radiation therapy

et al. 2020

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Semiconductor dosimeters are ubiquitous in modern external-beam radiation therapy. They possess key features. The response, electronically available in real time, is stable and linear with absorbed dose for given irradiation conditions; the radiation-sensitive volume can be rather small in size, while retaining mechanical strength and high sensitivity. We describe three common semiconductor dosimeters: diodes, metal-oxide-semiconductor field-effect transistors and diamonds. We discuss in detail their operation principles and applications in modern external-beam radiation therapy, primarily with megavoltage photon beams. We also explore their use in proton and heavy ion therapy, and in experimental radiotherapy techniques such as synchrotron-based micro-beam radiation therapy.

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Section: Synthetic Diamondsmentioning

confidence: 99%

Semiconductor dosimetry in modern external-beam radiation therapy

et al. 2020

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“…In previous papers [3,6,7], we have characterized the behavior of a single polycrystalline CVD (pCVD) synthetic diamond detector specifically developed for dosimetric purposes. Here we present the dosimetric characterization of an improved bidimensional pCVD detector with optimized contacts and composed of two pCVD diamonds each with area 2.5 × 2.5 cm 2 and a thickness of 300 µm.…”

Section: Jinst 12 C03052mentioning

confidence: 99%

“…A photograph of the diamond equipped with the matrix of pixels is shown in figure 1. A modular Printed Circuit Board (PCB) was designed and manufactured in order to connect the sample with the reading electronics (Texas Instrument evaluation board, 256 channels) [7]. The sample is fixed to the board and each pixel is connected with a Silver-Silicone paste.…”

Section: Pcvd Diamond Detectormentioning

confidence: 99%

Dosimetric characterization of a 2D polycrystalline CVD diamond detector

et al. 2017

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Background and aim: In modern radiotherapy techniques such as Intensity Modulated Radiation Therapy (IMRT) and Volumetric Modulated Arc Therapy (VMAT) dose gradients are generally high, with variations in space and time of both dose rate and beam energy spectrum. The dosimetry of small fields is challenging due to non-equilibrium conditions, and the introduction of radiation detectors usually perturbs the level of disequilibrium [Das et al., MP 2008]. Thus, the use of detectors for 2D dose verifications able to satisfy dosimetric needs, is mandatory. Polycrystalline Chemical Vapour Deposition (pCVD) Diamond is known to be an attractive material for dosimetric purposes. The aim of the study is the dosimetric characterization of a pCVD diamond bidimensional detector with photon beams produced by the linear accelerator ELEKTA Synergy installed at the Radiotherapy Unit of the University of Florence. Materials and Methods: The detector is composed of two Premium Detector Grade polycrystalline diamond films (Diamond Detector, UK) 2.5×2.5 cm 2 size and 300 μm thick each. In house Cr/Au electric contacts were realized on the front and rear surfaces. The upper contact is in form of a squared matrix of 12×12 pixels: 1.8×1.8mm 2 size, 2 mm pitch; back contact is a square pad. A custom printed circuit board connect each pixel with the electronic read-out board: each pixel is connected to the interface board via semi-rigid silver-silicone pins. For measurement purposes, the two pCVD films were sandwiched inside slabs of water equivalent material (PMMA) 3 cm thick each so as to guarantee the charged particle equilibrium. The detector was fed with 2V while the PCBs, fed with 5 V, ware connected to a PC. The device was placed at the Synergy isocenter and pieces of lead were put on the electronic components to minimize the radiation damage. A pre-irradiation with 5Gy was performed. The signal was acquired in current and charge. Every charge signal was calibrated with corrective factors matrix. Current rise and fall times were evaluated. To test the repeatability, the detector was subject to ten consecutive irradiations each of about 2 Gy, perfomed at three different dose rates: 107, 215 and 430 MU/min (MU, Monitor Unit). The dose rate dependence was studied in the range 52-430 MU/min by fitting the current against the dose rate with the Fowler semi-empirical expression I=I0+RDr  (I0 dark current) and by estimating the  value. The dose linearity (up to 500MU) was evaluated by fitting the charge signal against the dose for the dose rate 215 and 430 MU/min. The slope of the fit is the detector sensitivity. The Signal Ratios (SRs), defined as the ratio of the detector reading for a specified field size and a reference field, were obtained by varying the field size in the range 0.8×0.8-5.6×5.6 cm 2. The reference field was 3.0×3.0 cm 2. The SRs were compared with the ones measured by a synthetic Single Crystal Diamond Detector (SCDD) developed at the laboratories of "Tor Vergata" University in Rome [Marinelli et al., MP 2015]. SCDD ...

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“…The superior diamond resistance to ionizing radiation associated with its unique electronic properties like the mobility of charge carriers, the wide bandgap energy (5.47 eV) [1] and the consequent low leakage current makes it an appealing material for the detection of photons from UV [2][3][4] to X-rays [5][6][7], charged particles [8][9][10], thermal [11] and fast neutrons [12][13][14][15]. Detectors based on diamond demonstrated a fast response [6,16] and high sensitivity [17] to X-ray beams, providing high applied electric fields with low bias voltage [18] as well as photovoltaic-mode operations [19,20], which enabled the successful application to the medical sector for the monitoring of radiation beams utilized in radiation therapy [21][22][23] and mammography [24]. Diamond films can be even utilized as suitable active material in electrochemical devices [25], radiovoltaic batteries [26][27][28][29], and concentrated solar converters [30] as well as it is an efficient electron emitter [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

X-ray Spectrum Reconstruction by Diamond Detectors with Linear Response to Dose Rate

Trucchi

Ascarelli

2021

Crystals

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The absorbers method is here applied by interposing filters of variable thickness between the X-ray source and a detector so to attenuate the radiation intensity by using the attenuation coefficient as a selective photon energy operator. The analysis of the signal provided by a polycrystalline diamond thin film detector exposed to the energy-selectively-attenuated X-ray beam was used for the reconstruction of the radiation spectrum. The 50 μm thick diamond detector achieves conditions of linear response to the dose rate of the incident radiation (linearity coefficient of 0.997 ± 0.003) for a bias voltage ≥90 V, corresponding to an electric field ≥1.8 × 104 V/cm. Once the absorbers method is applied, only the detector signal linearity to dose rate allows reconstructing the source X-ray bremsstrahlung spectrum with sufficiently high accuracy.

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First dose-map measured with a polycrystalline diamond 2D dosimeter under an intensity modulated radiotherapy beam

Cited by 7 publications

References 6 publications

Semiconductor dosimetry in modern external-beam radiation therapy

Semiconductor dosimetry in modern external-beam radiation therapy

Dosimetric characterization of a 2D polycrystalline CVD diamond detector

X-ray Spectrum Reconstruction by Diamond Detectors with Linear Response to Dose Rate

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