Diamond X-ray personal dosimetry. Numerical evaluation against silicon response

Jung, M.; Meyer, Ph.; Morel, Jean‐Michel; Teissier, C.; Siffert, P.

doi:10.1016/s0168-9002(03)01948-x

Cited by 6 publications

(3 citation statements)

References 24 publications

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“…[1][2][3][4][5], for reasons including the near-tissue equivalence and high radiation tolerance of diamond, and low leakage current (which helps improve signal-noise ratio) due to high intrinsic resistivity. It is worth noting that, while diamond is described as near-tissue equivalent because of its atomic number (Z = 6), the mass density of diamond (3.51 g/cm 3 ) is much higher than water (1.00 g/cm 3 ), muscle (1.06 g/cm 3 ) [6] or fat (0.92 g/ cm 3 ) [7].…”

Section: Introductionmentioning

confidence: 99%

“…These detectors have a small sensitive volume (1-6 mm 3 ) and hence are marketed as being especially well suited for applications involving small fields and/or high dose gradients, such as intensity modulated radiotherapy (IMRT) and stereotactic beams. As they use a natural diamond crystal as the sensitive material, careful selection of the crystal is required to obtain suitable high-quality material and individual characterisation is needed because of variations between crystals.…”

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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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 has a number of properties that make it a potentially remarkable material for use as a radiation dosimeter including high-temperature operation stability, high radiation hardness, the resistance to high irradiation fluxes and its tissue equivalence [1,2,3], which indicates that there is no need to apply energy dependent signal corrections as a radiation dosimeter. Published work on natural diamond dosimeters [4,5] indicates that they have higher sensitivity and spatial resolution than Si diodes. However, the applications of such dosimeters are somewhat limited because of scarcity and difficulty in selecting suitable natural diamond.…”

Section: Introductionmentioning

confidence: 99%

Improvement in the Sensitivity of the Response of Diamond Thin Films to X-Ray

Liao

Ran

Gou

et al. 2007

KEM

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Due to some inferior performance of Chemical Vapor Deposition (CVD) diamond dosimeters, their applications are somewhat limited. The quality of diamond films was improved using Microwave Plasma CVD (MWPCVD) by the modified processes such as cyclic deposition and in-situ plasma post-treatment. The simple radiation dosimeters were fabricated in a sandwich configuration. Influence of purity and orientation of the diamond films on the sensitivity of the dosimeters was studied. The results indicate that the radiation dosimeters have high sensitivity to X-ray and the response of the devices is linear with the X-ray flux. The higher the purity of films is, the higher the resistivity and sensitivity are. The dosimeter based on [100] film has higher sensitivity than that based on [111] film. The dosimeter based on films prepared by cyclic deposition has higher sensitivity than that based on films prepared by the conventional deposition. The characterization of the response to X-ray also shows that in-situ oxygen plasma post-treatment leads to the higher sensitivity of dosimeters compared with in-situ nitrogen, hydrogen plasma post-treatments.

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