Operating parameters of CVD diamond detectors for radiation dosimetry

Betzel, G; Lansley, Stuart P.; Baluti, F.; Reinisch, Lou; Meyer, Juergen

doi:10.1016/j.nima.2009.12.008

Cited by 24 publications

(18 citation statements)

References 54 publications

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“…This relationship between photocurrent (and hence photoconductivity) and dose rate is expected according to Fowler [24]; reported a 7% increase in D when increasing the bias voltage from 100 V (0.2 V lm -1 ) to 1000 V (2 V lm -1 ) [26]. However, our previous work has shown a slight decrease in D with increasing bias voltage [14]; the maximum bias we have used is *250 V (0.5 V lm -1 ) as used in this paper. It is not possible, though, to compare applied electric fields as the thickness of the natural diamond in the PTW detector is unknown.…”

Section: Dose-rate Dependencesupporting

confidence: 77%

“…The full bias provided by this electrometer was measured as 246.50 V; biases of approximately one half, one quarter, and one eighth of the full voltage were also available. One quarter of the full voltage (measured as 61.75 V) was used to bias the PTW detector, in order to keep the bias below the maximum 100 V. The UC detector was biased using the full voltage (246.50 V) in order to obtain the highest sensitivity; the effect that the operating bias has on the performance of this detector was reported in [14].…”

Section: Electrometermentioning

confidence: 99%

“…At the University of Canterbury, we have been fabricating and characterising X-ray detectors from commercially-available synthetic diamond films [13][14][15]. In this paper we present a comparison between one of these synthetic diamond X-ray detectors and a commercial natural diamond detector.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of natural and synthetic diamond X-ray detectors

Lansley

Betzel

Metcalfe

et al. 2010

Australas Phys Eng Sci Med

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Diamond detectors are particularly well suited for dosimetry applications in radiotherapy for reasons including near-tissue equivalence and high-spatial resolution resulting from small sensitive volumes. However, these detectors have not become commonplace due to high cost and poor availability arising from the need for high-quality diamond. We have fabricated relatively cheap detectors from commercially-available synthetic diamond fabricated using chemical vapour deposition. Here, we present a comparison of one of these detectors with the only commercially-available diamond-based detector (which uses a natural diamond crystal). Parameters such as the energy dependence and linearity of charge with dose were investigated at orthovoltage energies (50-250 kV), and dose-rate dependence of charge at linear accelerator energy (6 MV). The energy dependence of a synthetic diamond detector was similar to that of the natural diamond detector, albeit with slightly less variation across the energy range. Both detectors displayed a linear response with dose (at 100 kV) over the limited dose range used. The sensitivity of the synthetic diamond detector was 302 nC/Gy, compared to 294 nC/Gy measured for the natural diamond detector; however, this was obtained with a bias of 246.50 V compared to a bias of 61.75 V used for the natural diamond detector. The natural diamond detector exhibited a greater dependency on dose-rate than the synthetic diamond detector. Overall, the synthetic diamond detector performed well in comparison to the natural diamond detector.

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Section: Dose-rate Dependencesupporting

confidence: 77%

Section: Electrometermentioning

confidence: 99%

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Comparison of natural and synthetic diamond X-ray detectors

Lansley

Betzel

Metcalfe

et al. 2010

Australas Phys Eng Sci Med

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“…Though often met with various challenges, most reports in literature have characterized the dosimetric performance of a given synthetic diamond detector to either low-energy X-rays (Assiamah et al, 2007), orthovoltage therapy X-rays (Buttar et al, 2000;Ramkumar et al, 2001), high-energy electron beams ( Van der Merwe et al, 1999), high-energy photon beams (Fidanzio et al, 2002;Marczewska et al, 2007;Gόrka et al, 2008;Tranchant et al, 2008;Betzel et al, 2010;Gervino et al, 2010;Schirru et al, 2010;De Angelis et al, 2010;Ciacaglioni et al, 2012;Marsolat et al, 2013) or both high-energy photons and electrons usually using one energy of each beam type (Fidanzio et al, 2004;Bruzzi et al, 2000) in large radiation fields. Only a few researchers such as Ciacaglioni et al (2012) and Marsolat et al (2013) have reported its use under small-field condition although Ciacaglioni et al (2012) used a synthetic single crystal diamond detector in a Schottky diode configuration.…”

Section: Introductionmentioning

confidence: 99%

An evaluation of a novel synthetic diamond probe for dosimetric applications

Ade

Nam

2015

Radiation Physics and Chemistry

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“…The linear response of the diamond detector current versus X-ray tube current (dose) is presented. [4,5]. For X-ray dosimetry applications of the diamond polycrystal is also used [6].…”

mentioning

confidence: 99%

X-Rays Response of Diamond Detectors Constructed Using Diamond Layers Produced by Low Power Microwave Chemical Vapor Deposition Reactor

et al. 2015

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The low power reactor for microwave chemical vapor deposition process is described. The rotating Mo holder of 12 mm diameter and 6 mm height with the diamond substrate was heated by 2.45 GHz microwaves to temperature about 800• C in the range of (1.57)% CH4/H2 mixture to create plasma at pressure 70 Tr. Stabilization of the holder temperature was performed by optical observation of radiation from the holder followed by adjusting of the magnetron power. Diamond detectors are produced using microwave chemical vapor deposition process grown on single crystal diamond high pressure high temperature Sumimoto substrates, [100] oriented. The response of diamond detectors for X-rays has been measured in the current mode using medical X-rays tube. The linear response of the diamond detector current versus X-ray tube current (dose) is presented.

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Operating parameters of CVD diamond detectors for radiation dosimetry

Cited by 24 publications

References 54 publications

Comparison of natural and synthetic diamond X-ray detectors

Comparison of natural and synthetic diamond X-ray detectors

An evaluation of a novel synthetic diamond probe for dosimetric applications

X-Rays Response of Diamond Detectors Constructed Using Diamond Layers Produced by Low Power Microwave Chemical Vapor Deposition Reactor

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