Recent improvements on the use of CVD diamond ionisation chambers for radiotherapy applications

Guerrero, M.J.; Tromson, D.; Descamps, C.; Bergonzo, P.

doi:10.1016/j.diamond.2005.12.056

Cited by 30 publications

(14 citation statements)

References 8 publications

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“…Diamonds are regarded as suitable materials for radiation detection purposes when used as solid‐state ionisation chambers. One of its advantages is its near tissue equivalence 1–6 where its atomic number is comparable to that of human tissue ( Z = 6 for diamond and Z ≈ 7.5 for human tissues). Thus the energy absorbed by the diamond is similar to that absorbed by human tissue, which reduces the need for correction mechanisms 6.…”

Section: Introductionmentioning

confidence: 99%

The effect of annealing on the X‐ray induced photocurrent characteristics of CVD diamond radiation detectors with different electrical contacts

Abdel‐Rahman

Lohstroh

Sellin

2011

Physica Status Solidi (a)

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An investigation on the influence of metal–diamond interfaces on the X‐ray induced photocurrent characteristics of diamond based solid state radiation detectors has been performed before and after annealing in order to identify the parameters of metal contact formation which maximise the performance. For this purpose, two different samples with different metal contacts were fabricated by sputtering Pt (labelled HPS‐Pt) and Al/Pt (labelled HPS‐Al/Pt) on to high quality CVD diamond. To examine the performance of the two samples, a set of measurements was performed before and after annealing the devices: I–V characteristics, time response such as rise and fall‐off times, sensitivity and specific sensitivity, signal to noise ratio (SNR), photoconductive gain, dose rate dependence and reproducibility were studied. The effect of the changes in bias voltage on the performance of the samples was also investigated. The response of annealing the devices is strongly dependent on the metal contact. HPS‐Al/Pt showed a strong increase in the current amplitude (∼240 times the value before annealing) and the stability is improved as a high overshoot is totally removed after annealing. Annealing HPS‐Pt showed a slight increase in the current amplitude and the small overshoot existing at low dose rate is also removed, however the stability of the currents is reduced which affected the reproducibility of the signal.

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Section: Introductionmentioning

confidence: 99%

The effect of annealing on the X‐ray induced photocurrent characteristics of CVD diamond radiation detectors with different electrical contacts

Abdel‐Rahman

Lohstroh

Sellin

2011

Physica Status Solidi (a)

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“…In particular, the photocurrent shows a short rise time followed by a slow decay towards a steady state. Such a current dynamic, generally called "overshoot" (13)(14)(15), has been attributed to a built-in charge into the material (13)(14)(15)(16)(17). Switching off the light source, the current changes sign in a time interval shorter than the electrometer response.…”

Section: Device Fabrication and Electro-optical Characterizationmentioning

confidence: 97%

Single-crystal diamond MIS diode for deep UV detection

Alfieri

Almaviva

Sio

et al. 2010

Radiation Effects and Defects in Solids

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Due to its exceptional physical properties, synthetic diamond is an ideal material for the realization of UV and X-ray detectors to be used for the characterization of laser-generated plasmas. Diamond detectors are able to operate at high temperatures and in the presence of high fluxes of ionizing radiation, where traditional silicon-based detectors usually fail. In this paper, we report on Raman and electro-optical characterization of a structure consisting of intrinsic diamond/boron-doped diamond homoepitaxially grown by chemical vapor deposition onto a commercial high pressure high temperature Ib-type diamond substrate using a 1% CH 4 /H 2 gas mixture. A metal-insulator-semiconductor (MIS) diode was obtained by thermally evaporating an aluminum contact on the growth surface of the intrinsic layer. The detection capability of this device operating in transverse configuration was measured in the deep UV spectral range. The device sensitivity has been estimated at different biasing voltages and at two wavelengths having different penetration depths into the material. The device was also tested at zero biasing voltage (photovoltaic mode operation), showing quite a good photoresponse. These results suggest that MIS structures based on high-quality homoepitaxial diamonds may be successfully utilized for photodetection even at zero bias.

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“…Diamond thin films synthesized by different chemical vapor deposition (CVD) techniques have been investigated as ther moluminescent materials for medical application [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

High dosage thermoluminescence diamond dosimeters

Hernández-Ortiz

Bernal

Crúz-Vázquez

et al. 2012

J. Superhard Mater.

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Diamond thin films have been irradiated with high doses (up to 12.8 kGy) of 90 Sr beta particles. The diamond thin films have been synthesized from commercial Tequila as a precursor using Pulsed Liq uid Injection by the Chemical Vapor Deposition (PLICVD) technique reported recently. Thermolumines cence (TL) phenomena at these doses exhibit peak curve shift to higher temperatures (from 370 to 440 K) in the glow curve and the integrated TL curve show a linear behavior. Therefore, it has been considered that diamond thin films could be used as high doses dosimeters.

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Recent improvements on the use of CVD diamond ionisation chambers for radiotherapy applications

Cited by 30 publications

References 8 publications

The effect of annealing on the X‐ray induced photocurrent characteristics of CVD diamond radiation detectors with different electrical contacts

The effect of annealing on the X‐ray induced photocurrent characteristics of CVD diamond radiation detectors with different electrical contacts

Single-crystal diamond MIS diode for deep UV detection

High dosage thermoluminescence diamond dosimeters

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