Synthetic single crystal diamond dosimeters for conformal radiation therapy application

Almaviva, S.; Ciancaglioni, I.; Consorti, R.; Notaristefani, F. De; Manfredotti, C.; Marinelli, M.; Petrucci, A.; Prestopino, G.; Verona, C.; Verona-Rinati, G.

doi:10.1016/j.diamond.2009.10.007

Cited by 16 publications

(14 citation statements)

References 15 publications

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“…Doses to achieve the 92.5% of the final signal are~1 Gy and 8 Gy for samples ES5-ES9, those to reach the 99.5% are~20 Gy (ES5) and~8 Gy (ES9). These values of pre-irradiation are comparable to those reported for the single crystal diamond dosimeter (10-15 Gy) [17] and for the PTW natural diamond (5-15 Gy) [29]. For comparison we show in Fig.…”

Section: Pre-irradiationsupporting

confidence: 75%

“…To directly compare our results with the single crystal diamond dosimeter reported in Ref. [17] we calculated the linear behaviour index α as given by fitting experimental data with the function y = ax α (see inset on the right): we obtain α = 1.0085, a value very close to unity which proves the good linearity of the response over three decades. Further, to directly compare our results with those reported in Ref.…”

Section: Linearitymentioning

confidence: 90%

“…Measured values of sensitivity per unit area are 4 nC/Gymm e.g. reported in [17]), but definitely lower than that of PTW natural diamond (18.6 nC/Gymm 2 measured at 100 V) and of the pCVD diamond when kept under bias (e.g. 268.8 nC/Gymm 2 for sample ES1 at 100 V).…”

Section: Sensitivitymentioning

confidence: 99%

“…High electronic quality homoepitaxial diamond can be grown on high temperature high pressure (HPHT) diamond substrates by a CVD method, to produce synthetic single crystal CVD diamond films (scCVD) [15]. Recently, it has been demonstrated that dosimeters made with such scCVD diamond films exposed to X-photons are characterised by a fast, reproducible and stable dynamics, making them suitable for IMRT applications [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Zero-bias operation of polycrystalline chemically vapour deposited diamond films for Intensity Modulated Radiation Therapy

Bruzzi

Angelis

Scaringella

et al. 2011

Diamond and Related Materials

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A detailed investigation of the performance as a dosimeter of state-of-art polycrystalline CVD (pCVD) diamond detectors operated in photovoltaic regime for applications in clinical radiotherapy has been carried out with conventional 6-10-18 MV X-photons, as well as with a 10 MV photon Intensity Modulated Radiation Therapy (IMRT) beam from a linear accelerator. Our results show that the performances of a pCVD diamond dosimeter improves dramatically when operated in null-bias conditions. Main improvements with respect to operation with an external voltage applied are: a reduced pre-irradiation dose; an excellent time stability, characterised by standard deviations less than 0.5%; a rise-time comparable to that of commercial reference dosimeters; a linearity with dose proven over three decades; a reduced deviation from linearity of the current vs. dose-rate curve, output factors comparable to that of commercial reference dosimeters. These results represent a significant step towards clinical applications as IMRT with synthetic polycrystalline CVD diamond films.

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Section: Pre-irradiationsupporting

confidence: 75%

Section: Linearitymentioning

confidence: 90%

Section: Sensitivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Zero-bias operation of polycrystalline chemically vapour deposited diamond films for Intensity Modulated Radiation Therapy

Bruzzi

Angelis

Scaringella

et al. 2011

Diamond and Related Materials

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“…The results on sensitivity, response dynamics and linearity of the current response with dose-rate show that our device is compatible with IMRT applications. The device shows performances comparable to those reported for synthetic single crystal diamond (scCVD) dosimeters [15], which operated in null-bias as well. Authors in [15] attribute this behavior to the high crystalline quality of the single crystal material: our results suggest that a significant contribution to the performances could be as well attributed to the null-bias operation of the device.…”

Section: Discussionsupporting

confidence: 62%

High- quality polycrystalline CVD diamond for conformal radiotherapy applications

Talamonti¹

2012

Proceedings of 10th International Conference on Large Scale Applications and Radiation Hardness of Semiconductor Detectors — Po

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-A bidimensional dosimeter made with a state-of art polycrystalline Chemical Vapour Deposited (pCVD) diamond for applications in clinical radiotherapy has been manufactured in the framework of the DIAPIX project (INFN-CSN5). It is constituted by a large area (2.5x2.5cm2 ) pCVD diamond film equipped with in-house electrical contacts on the front and rear surfaces in transverse geometry. Upper contact, made on the growth side of the film, is in form of a squared matrix of 24x24 pixels, pixel size 0.8 mm x 0.8mm, 300nm thick, pitch 1mm. Optimization of the operational conditions has been performed studying a few pixels along the matrix. Instability effects due to trapping-detrapping mechanisms were observed to be negligible at low bias. These results confirm that the pCVD diamond device is suitable for mapping the bidimensionally conformed dose in an Intensity Modulated Radiation Therapy (IMRT) treatment.

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Lateral IBIC characterization of single crystal synthetic diamond detectors

Giudice

Olivero

Manfredotti

et al. 2011

Physica Rapid Research Ltrs

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In order to evaluate the charge collection efficiency (CCE) profile of single-crystal diamond devices based on a p-type/intrinsic/metal configuration, a lateral Ion Beam Induced Charge (IBIC) analysis was performed over their cleaved cross sections using a 2 MeV proton microbeam. CCE profiles in the depth direction were extracted from the cross-sectional maps at variable bias voltage. IBIC spectra relevant to the depletion region extending beneath the frontal Schottky electrode show a 100% CCE, with a spectral resolution of about 1.5%. The dependence of the width of the high efficiency region from applied bias voltage allows the constant residual doping concentration of the active region to be evaluated. The region where the electric field is absent shows an exponentially decreasing CCE profile, from which it is possible to estimate the diffusion length of the minority carriers by means of a drift-diffusion model. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

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Synthetic single crystal diamond dosimeters for conformal radiation therapy application

Cited by 16 publications

References 15 publications

Zero-bias operation of polycrystalline chemically vapour deposited diamond films for Intensity Modulated Radiation Therapy

Zero-bias operation of polycrystalline chemically vapour deposited diamond films for Intensity Modulated Radiation Therapy

High- quality polycrystalline CVD diamond for conformal radiotherapy applications

Lateral IBIC characterization of single crystal synthetic diamond detectors

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