Dosimetry with a diamond operating as a resistor

Burgemeister, E.A.

doi:10.1088/0031-9155/26/2/006

Cited by 68 publications

(30 citation statements)

References 14 publications

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“…Thus diamond crystals suitable for radiation dosimetry need a certain concentration of impurities, but too much will cause the diamond to be insensitive and to suffer from polarization effects. Suitable diamond crystals for dosimetry are of the colorless type IIa 11 , 12 with a low nitrogen concentration of less than

10^{19} {cm}^{- 3}

.…”

Section: Introductionmentioning

confidence: 99%

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Clinical radiation therapy measurements with a new commercial synthetic single crystal diamond detector

Laub

Crilly

2014

J Applied Clin Med Phys

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A commercial version of a synthetic single crystal diamond detector (SCDD) in a Schottky diode configuration was recently released as the new type 60019 microDiamond detector (PTW‐Freiburg, Germany). In this study we investigate the dosimetric properties of this detector to independently confirm that findings from the developing group of the SCDDs still hold true for the commercial version of the SCDDs. We further explore if the use of the microDiamond detector can be expanded to high‐energy photon beams of up to 15 MV and to large field measurements. Measurements were performed with an Elekta Synergy linear accelerator delivering 6, 10, and 15 MV X‐rays, as well as 6, 9, 12, 15, and 20 MeV electron beams. The dependence of the microdiamond detector response on absorbed dose after connecting the detector was investigated. Furthermore, the dark current of the diamond detector was observed after irradiation. Results are compared to similar results from measurements with a diamond detector type 60003. Energy dependency was investigated, as well. Photon depth‐dose curves were measured for field sizes 3×3,10×10, and 30×30.15emcm2. PDDs were measured with the Semiflex type 31010 detector, microLion type 31018 detector, P Diode type 60016, SRS Diode type 60018, and the microDiamond type 60019 detector (all PTW‐Freiburg). Photon profiles were measured at a depth of 10 cm. Electron depth‐dose curves normalized to the dose maximum were measured with the 14×14.15emcm2 electron cone. PDDs were measured with a Markus chamber type 23343, an E Diode type 60017 and the microDiamond type 60019 detector (all PTW‐Freiburg). Profiles were measured with the E Diode and microDiamond at half of D90,D90,D70, and D50 depths and for electron cone sizes of 6×6.15emcm2, 14×14.15emcm2, and 20×20.15emcm2. Within a tolerance of 0.5% detector response of the investigated detector was stable without any preirradiation. After preirradition with approximately 250 cGy the detector response was stable within 0.1%. A dark current after irradiation was not observed. The microDiamond detector shows no energy dependence in high energy photon or electron dosimetry. Electron PDD measurements with the E Diode and microDiamond are in good agreement. However, compared to E Diode measurements, dose values in the bremsstrahlungs region are about 0.5% lower when measured with the microDiamond detector. Markus detector measurements agree with E Diode measurements in the bremsstrahlungs region. For depths larger than dmax, depth‐dose curves of photon beams measured with the microDiamond detector are in close agreement to those measured with the microLion detector for small fields and with those measured with a Semiflex 0.125 cc ionization chamber for large fields. Differences are in the range of 0.25% and less. For profile measurements, microDiamond detector measurements agree well with microLion and P Diode measurements in the high‐dose region of the profile and the penumbra region. For areas outside the open field, P Diode measurements are about 0.5%–1.0% highe...

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10^{19} {cm}^{- 3}

.…”

Section: Introductionmentioning

confidence: 99%

“…Studies in contact technology have been reported by several authors 5 , 6 , 10 , 11 . It is necessary to find contact materials which do not lead to an energy dependence of the diamond detector in high‐energy dosimetry.…”

Section: Introductionmentioning

confidence: 99%

Clinical radiation therapy measurements with a new commercial synthetic single crystal diamond detector

Laub

Crilly

2014

J Applied Clin Med Phys

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“…In particular, its large bandgap (5.5 eV), radiation hardness, optical transparency, large saturated carrier velocities, and low atomic number, make diamond a very attractive candidate for the detection of ionizing radiation in applications as dosimeter as well as in high energy experiments. Diamond as ionization detector was proposed by Hofstadter in the 1940s [62], and several studies were performed for the characterization of the material and for applications in nuclear physics and dosimetry [63,64]. However, these detectors found restricted usage due to limitations of natural diamonds, mainly the small size and the uncontrolled material characteristics [65].…”

Section: Diamondmentioning

confidence: 99%

Semiconductor Characterization by Scanning Ion Beam Induced Charge (IBIC) Microscopy

Vittone

2013

ISRN Materials Science

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e ion beam induced charge (IBIC) technique is a scanning microscopy technique which uses �nely focused MeV ion beams as probes to measure and image the transport properties of semiconductor materials and devices. Its success stems from the combination of three main factors: the �rst is strictly technical and lies in the availability of laboratories and expertise around the world to provide scanning MeV ion beams focused down to submicrometer spots. e second reason stems from the peculiarity of MeV ion interaction with matter, due to the ability to penetrate tens of micrometers with reduced scattering and to excite a high number of free carriers to produce a measurable charge pulse from each incident ion. Last, but not least, is the availability of a robust theoretical model able to extract from the measurements all the parameters for an exhaustive characterization of the semiconductor. is paper is focused on these two latter issues, which are examined by reviewing the current status of IBIC by a comprehensive survey of the theoretical model and remarkable examples of IBIC applications and of ancillary techniques to the study of advanced semiconductor materials and devices.

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“…The potential use of such material for ionizing radiation dosimetry by thermoluminescence have been investigated since 1980. Natural diamond has been examined but thermoluminescence (TL) signal was very weak and not reproducible [3,4]. Diamond (Z = 6) with its atomic number being close to the effective atomic number of biological tissue (Z = 7.42) can be considered as a tissue-equivalent material.…”

Section: Introductionmentioning

confidence: 99%

Study of the Thermoluminescence of CVD Diamond

et al. 2012

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This work reports some thermoluminescent properties of chemical vapour deposition diamond film grown by 5 kW microwave assisted plasma chemical vapour deposition. The 2 diamond sample with the thickness of 32 µm was exposed to gamma radiation in the dose range 0.6-55 Gy. The thermoluminescent glow curve of diamond sample displayed a peak with the maximum centered at 240• C. The linearity of the detector response in the range of 10-55 Gy was observed. The bleaching effect, seen as fading of the thermoluminescent signal when the device was exposed to light in the visible range, was also noticed. Two-dimensional dose distribution was measured using 2D thermoluminescent reader equipped with a sensitive 640 × 480 pixels charge coupled device camera. The surface morphology of the diamond film was observed with scanning electron microscope and atomic force microscope. The grain size was estimated as about 15 µm. The Raman spectroscopy was used to characterize phase purity. The width and position of the diamond Raman band around 1332 cm −1 indicated that the coating is crystalline and of good quality. It is concluded that good quality chemical vapour deposition diamond coating could be promising material for thermoluminescent dosimetry.

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Dosimetry with a diamond operating as a resistor

Cited by 68 publications

References 14 publications

Clinical radiation therapy measurements with a new commercial synthetic single crystal diamond detector

Clinical radiation therapy measurements with a new commercial synthetic single crystal diamond detector

Semiconductor Characterization by Scanning Ion Beam Induced Charge (IBIC) Microscopy

Study of the Thermoluminescence of CVD Diamond

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