Clinical studies of optimised single crystal and polycrystalline diamonds for radiotherapy dosimetry

Descamps, C.; Tromson, D.; Tranchant, Nicolas; Isambert, A.; Bridier, A.; Angelis, C. De; Onori, S.; Bucciolini, M.; Bergonzo, P.

doi:10.1016/j.radmeas.2007.11.080

Cited by 27 publications

(11 citation statements)

References 11 publications

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“…For the Poly-C device the sensitivity value was ~6 nC/Gy. This value is consistent with previous reports [9,19] by Descamps et al and Fidanzio et al who found a sensitivity of (2 -3) nC/Gy for polycrystalline diamond samples. Their result is explained to be due to the high defect concentration in polycrystalline material.…”

Section: Signal Amplitudesupporting

confidence: 94%

The X-ray detection performance of polycrystalline CVD diamond with pulsed laser deposited carbon electrodes

Abdel‐Rahman

Lohstroh

Jayawardena

et al. 2012

Diamond and Related Materials

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Section: Signal Amplitudesupporting

confidence: 94%

The X-ray detection performance of polycrystalline CVD diamond with pulsed laser deposited carbon electrodes

Abdel‐Rahman

Lohstroh

Jayawardena

et al. 2012

Diamond and Related Materials

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“…This values are in agreement with those reported in literature (0.86 -1.035) for both PTW natural single crystal diamonds and CVD synthetic diamond devices [12,13]. The detector sensitivities were found between 4.03 and 4.28 nC/Gy which are comparable with the values calculated in [14] for polycrystalline diamond detectors. One of the quality parameters of a detector can be estimated by the knowledge of its gain factor G defined as I m /I g where I m is detector current measured and I g the current induced by the radiation field.…”

Section: Resultssupporting

confidence: 92%

“…At ±100 V the leakage current did not exceed 5 pA leading to a minimum bulk resistivity of at least 2.8·10 14 Ωcm. This value is in agreement with others reported in literature for polycrystalline diamond samples [9].…”

Section: Resultsmentioning

confidence: 97%

X-ray induced photocurrent characteristics of CVD diamond detectors with different carbon electrodes

et al. 2013

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Diamond has unique properties which make it suitable for a broad range of radiation detection applications ranging from particle timing and spectroscopy, to neutron, UV and X-ray sensors. In X-ray dosimetry, the atomic number of diamond (Z = 6) close to that of the human tissues (Z = 7.42) allows to mimic the real absorbed dose avoiding off-line recalculations. Moreover, its low atomic number and the capability to withstand high radiation fluxes make possible its use as beam monitor without altering significantly the properties of the interacting beam. To preserve the tissue equivalence of the diamond and minimize the perturbation and absorption of the incident beam, diamond detectors based on low thickness and low atomic number electrodes become a requirement. In this paper we present the X-ray detection characteristics of electronic grade CVD diamond sensors prepared in house with thin amorphous carbon electrodes fabricated by Pulsed Laser Deposition (PLD) technique in the fluence range of 2.3 -3.6 J•cm -2 . The devices showed a linear dependence of the induced photocurrent respect to the dose rate. Also, best dynamic response and better stability of the signals were achieved for applied bias up to ±50 V with signal to noise ratio (SNR) of ~300.

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“…[18][19][20][21][22][23][24] Most papers on diamond dosimeters are dedicated to commercial natural diamond-based detectors from PTW. Polycrystalline chemical vapor deposition (CVD) diamond [25][26][27][28] and CVD or high-pressure high-temperature (HPHT) synthetic single crystal diamond [29][30][31] have been also studied as radiation therapy dosimeters. However, lack of reproducibility, difficulties in controlling impurities incorporation in synthetic crystals, and problems related to encapsulation techniques make the performance of such devices still far from the ones of PTW natural diamond detectors.…”

Section: Introductionmentioning

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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Clinical studies of optimised single crystal and polycrystalline diamonds for radiotherapy dosimetry

Cited by 27 publications

References 11 publications

The X-ray detection performance of polycrystalline CVD diamond with pulsed laser deposited carbon electrodes

The X-ray detection performance of polycrystalline CVD diamond with pulsed laser deposited carbon electrodes

X-ray induced photocurrent characteristics of CVD diamond detectors with different carbon electrodes

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

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