An investigation of the operating characteristics of two PTW diamond detectors in photon and electron beams

Angelis, C. De; Onori, S.; Pacilio, Massimiliano; Cirrone, G.A.P.; Cuttone, G.; Raffaele, L.; Bucciolini, M.; Mazzocchi, S.

doi:10.1118/1.1446101

Cited by 71 publications

(45 citation statements)

References 13 publications

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“…This effect, also observed for D(Ti-Au), indicates the existence of an amount of deep traps quite stable at room temperature. A similar behaviour was reported by some of the present authors (11) with PTW natural diamond detectors for which a daily pre-irradiation dose lower than that initially required to get stability is necessary if irradiation runs are performed on successive days. Also, the dose rate dependence of F56 improved after neutron irradiation.…”

Section: Resultssupporting

confidence: 64%

Improvements in CVD diamond properties for radiotherapy dosimetry

Angelis¹,

Bucciolini²,

Casati³

et al. 2006

Radiation Protection Dosimetry

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The goal of this work was to compare the behaviour of a chemical vapour deposited (CVD) diamond sample, grown at the University of Florence using a local procedure, with that of a commercial CVD diamond. The comparison was performed exposing both systems to 25 MV photons and measuring the current response during irradiation. Properties of dosimetric interest such as stability of response, dose rate dependence and rise time were investigated. After a preliminary study, which evidenced better performances of the commercial device with respect to the local CVD diamond, the latter was irradiated with a high fluence of fast neutrons. As a result of the neutron treatment, the quality of the CVD home-made diamond has been improved to match with that of the commercial dosemeter.

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Section: Resultssupporting

confidence: 64%

Improvements in CVD diamond properties for radiotherapy dosimetry

Angelis¹,

Bucciolini²,

Casati³

et al. 2006

Radiation Protection Dosimetry

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“…Although in agreement in the overall trends, such a dependence is somewhat higher than the one reported in literature for PTW natural diamonds. 22,41 This is possibly due to the intrinsic fabrication asymmetry of our diamond devices, with few μm thick active layer on top of a ∼400 μm thick substrate. In addition, a significant part of the angular dependence could also arise from the encapsulating materials, their interfaces, the electrode materials, and cables.…”

Section: Iiie Angular Responsementioning

confidence: 99%

“…27,[38][39][40] Results reported in literature for commercial detectors based on natural single crystal diamond indicate a relatively poor intersample reproducibility of the preirradiation dose required to reach a stable response. [21][22][23][24]41 Values ranging from 5 to 15 Gy are reported, depending on the specific impurity concentration into the sample.…”

Section: Iiia Response Stability Response Time and Sensitivity Ofmentioning

confidence: 99%

Dosimetric characterization of a synthetic single crystal diamond detector in clinical radiation therapy small photon beams

Ciancaglioni¹,

Marinelli²,

Milani³

et al. 2012

Med. Phys.

115

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Purpose:To determine the potentialities of synthetic single crystal diamond Schottky diodes for accurate dose measurements in radiation therapy small photon beams. Methods: The dosimetric properties of a diamond-based detector were assessed by comparison with a reference microionization chamber. The diamond device was operated at zero bias voltage under irradiation with high-energy radiotherapic photon beams. The stability of the detector response and its dose and dose rate dependence were measured. Different square field sizes ranging from 1 × 1 cm 2 to 10 × 10 cm 2 were used during comparative dose distribution measurements by means of percentage depth dose curves (PDDs), lateral beam profiles, and output factors. The angular and temperature dependence of the diamond detector response were also studied.Results: The detector response shows a deviation from linearity of less than ±0.5% in the 0.01-7 Gy range and dose rate dependence below ±0.5% in the 1-6 Gy/min range. PDDs and output factors are in good agreement with those measured by the reference ionization chamber within 1%. No angular dependence is observed by rotating the detector along its axis, while ∼3.5% maximum difference is measured by varying the radiation incidence angle in the polar direction. The temperature dependence was investigated as well and a ±0.2% variation of the detector response is found in the 18-40• C range. Conclusions:The obtained results indicate the investigated synthetic diamond-based detector as a candidate for small field clinical radiation dosimetry in advanced radiation therapy techniques.

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“…5 Most studies on diamond application for megavoltage electron and photon radiotherapy beam dosimetry have been performed using PTW natural diamond detectors and are reported as comparative investigations with respect to reference detectors, i.e., ionization chambers and silicon diodes. 5,[16][17][18][19][20][21] Although natural diamonds are well assessed in the market, their use is limited by a number of drawbacks, such as high costs, long delivery time due to suitable stones selection, lack of response reproducibility among detectors, and high dose rate dependence, which implies the use of a sampledependent correction factor in dosimetric measurements. On the other hand, spotty results have been reported on synthetic high-pressure high-temperature (HPHT) (Refs.…”

Section: Introductionmentioning

confidence: 99%

Characterization of a synthetic single crystal diamond Schottky diode for radiotherapy electron beam dosimetry

Venanzio

Marinelli²,

Milani³

et al. 2013

Med. Phys.

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Purpose: To investigate the dosimetric properties of synthetic single crystal diamond based Schottky diodes under irradiation with therapeutic electron beams from linear accelerators. Methods: A single crystal diamond detector was fabricated and tested under 6, 8, 10, 12, and 15 MeV electron beams. The detector performances were evaluated using three types of commercial detectors as reference dosimeters: an Advanced Markus plane parallel ionization chamber, a Semiflex cylindrical ionization chamber, and a p-type silicon detector. Preirradiation, linearity with dose, dose rate dependence, output factors, lateral field profiles, and percentage depth dose profiles were investigated and discussed. Results: During preirradiation the diamond detector signal shows a weak decrease within 0.7% with respect to the plateau value and a final signal stability of 0.1% (1σ ) is observed after about 5 Gy. A good linear behavior of the detector response as a function of the delivered dose is observed with deviations below ±0.3% in the dose range from 0.02 to 10 Gy. In addition, the detector response is dose rate independent, with deviations below 0.3% in the investigated dose rate range from 0.17 to 5.45 Gy/min. Percentage depth dose curves obtained from the diamond detector are in good agreement with the ones from the reference dosimeters. Lateral beam profile measurements show an overall good agreement among detectors, taking into account their respective geometrical features. The spatial resolution of solid state detectors is confirmed to be better than that of ionization chambers, being the one from the diamond detector comparable to that of the silicon diode. A good agreement within experimental uncertainties was also found in terms of output factor measurements between the diamond detector and reference dosimeters. Conclusions: The observed dosimetric properties indicate that the tested diamond detector is a suitable candidate for clinical electron beam dosimetry.

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An investigation of the operating characteristics of two PTW diamond detectors in photon and electron beams

Cited by 71 publications

References 13 publications

Improvements in CVD diamond properties for radiotherapy dosimetry

Improvements in CVD diamond properties for radiotherapy dosimetry

Dosimetric characterization of a synthetic single crystal diamond detector in clinical radiation therapy small photon beams

Characterization of a synthetic single crystal diamond Schottky diode for radiotherapy electron beam dosimetry

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