An evaluation of some pertinent parameters that influence the dosimetric performance of synthetic diamond detectors

Ade, Nicholas; Nam, T.L.; Mhlanga, S.

doi:10.1016/j.radphyschem.2013.01.038

Cited by 6 publications

(6 citation statements)

References 34 publications

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“…Presented in Table 1 are values of the [N s ] for the diamond crystals as determined by ESR. The reason for the much higher levels of N s impurities of the HPHT and OG crystals compared to the DG samples has been explained in our previous study (Ade et al, 2013).…”

Section: Esr and Ftir Absorption Spectroscopymentioning

confidence: 62%

“…(3)) which expresses the contribution of the leakage current to the measured detector current I, might therefore influence the dose rate dependence of a given detector depending on its magnitude and fluctuation. In this study the leakage current of each diamond detector which was observed to be greatly influenced by ambient light was investigated in a similar procedure as reported in a previous study (Ade et al, 2012). The HPHT sample was found to have the lowest dark current value which did not vary between irradiations compared to its CVD counterparts and it was observed that the dark current increases with applied voltage.…”

Section: Dependence Of δ On Beam Energy and Typementioning

confidence: 70%

“…6 since the performance of the diamonds is influenced by the combined effect of the C-H and N3 levels. The poor performance of OGA1 and OGA2 might be influenced by non-uniform distribution of C-H centres as our previous study (Ade et al, 2013) indicated that the uneven distribution of defects in an OG CVD diamond have a greater influence on its performance (instability of response) compared to HPHT and DG CVD diamonds.…”

Section: Dependence Of δ On Beam Energy and Typementioning

confidence: 82%

“…The tested diamonds included eight polycrystalline chemical vapour deposition (CVD) crystals of detector grade (DG) and optical grade (OG) qualities and one high-pressure, high-temperature (HPHT) sample (Table 1). The opposite surfaces of each of the crystals were metallised as reported in a previous study (Ade et al, 2012) to provide the necessary ohmic contacts for voltage biasing and acquisition of the signal produced by ionising radiation. For quality control, identification and/or determination of defect/impurity types and levels, the crystals were characterised using Raman spectroscopy, Electron spin resonance (ESR) and Fourier transform infrared (FTIR) absorption spectroscopy.…”

Section: Methodsmentioning

confidence: 99%

“…Each diamond crystal was encapsulated in a probe housing as described in a previous study (Ade et al, 2012) and the probe, placed in its customised Perspex phantom was connected to a PTW-Freiburg Unidos E electrometer system operated manually in the 'charge' mode. The probe, constructed of entirely tissue-equivalent material with a Perspex body can hold diamond crystals of various dimensions up to 10 Â 10 mm 2 in size, has features which allow crystals to be exposed in different exposure orientations 1 ('edge-on' and 'flaton') for impinging radiation and is furthermore compatible with commercially available electrometer systems.…”

Section: Methodsmentioning

confidence: 99%

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The influence of defect levels on the dose rate dependence of synthetic diamond detectors of various types on exposures to high-energy radiotherapy beams

Ade

Nam

2015

Radiation Physics and Chemistry

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Section: Esr and Ftir Absorption Spectroscopymentioning

confidence: 62%

Section: Dependence Of δ On Beam Energy and Typementioning

confidence: 70%

Section: Dependence Of δ On Beam Energy and Typementioning

confidence: 82%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

The influence of defect levels on the dose rate dependence of synthetic diamond detectors of various types on exposures to high-energy radiotherapy beams

Ade

Nam

2015

Radiation Physics and Chemistry

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Investigation of a synthetic diamond detector response in kilovoltage photon beams

et al. 2020

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Purpose An important characteristic of radiation dosimetry detectors is their energy response which consists of absorbed‐dose and intrinsic energy responses. The former can be characterized using Monte Carlo (MC) simulations, whereas the latter (i.e., detector signal per absorbed dose to detector) is extracted from experimental data. Such a characterization is especially relevant when detectors are used in nonrelative measurements at a beam quality that differs from the calibration beam quality. Having in mind the possible application of synthetic diamond detectors (microDiamond PTW 60019, Freiburg, Germany) for nonrelative dosimetry of low‐energy brachytherapy (BT) beams, we determined their intrinsic and absorbed‐dose energy responses in 25–250 kV beams relative to a 60Co beam, which is usually the reference beam quality for detector calibration in radiotherapy. Material and Methods Three microDiamond detectors and, for comparison, two silicon diodes (PTW 60017) were calibrated in terms of air‐kerma free in air in six x‐ray beam qualities (from 25 to 250 kV) and in terms of absorbed dose to water in a 60Co beam at the national metrology laboratory in Sweden. The PENELOPE/penEasy MC radiation transport code was used to calculate the absorbed‐dose energy response of the detectors (modeled based on blueprints) relative to air and water depending on calibration conditions. The MC results were used to extract the relative intrinsic energy response of the detectors from the overall energy response. Measurements using an independent setup with a single ophthalmic BEBIG I25.S16 125I BT seed (effective photon energy of 28 keV) were used as a qualitative check of the extracted intrinsic energy response correction factors. Additionally, the impact of the thickness of the active volume as well as the presence of extra‐cameral components on the absorbed‐dose energy response of a microDiamond detector was studied using MC simulations. Results The relative intrinsic energy response of the microDiamond detectors was higher by a factor of 2 in 25 and 50 kV beams compared to the 60Co beam. The variation in the relative intrinsic energy response of silicon diodes was within 10% over the investigated photon energy range. The use of relative intrinsic energy response correction factors improved the agreement among the absorbed dose to water values determined using microDiamond detectors and silicon diodes, as well as with the TG‐43 formalism‐based calculations for the 125I seed. MC study of microDiamond detector design features provided a possible explanation for inter‐detector response variation at low‐energy photon beams by differences in the effective thickness of the active volume. Conclusions MicroDiamond detectors had a non‐negligible variation in the relative intrinsic energy response (factor of 2) which was comparable to that in the absorbed‐dose energy response relative to water at low‐energy photon beams. Silicon diodes, in contrast, had an absorbed‐dose energy dependence on photon energy that varied by a factor of 6, whe...

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The dose rate dependence of synthetic diamond detectors in the relative dosimetry of high-energy electron therapy beams

Ade

Nam

Derry

et al. 2014

Radiation Physics and Chemistry

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An evaluation of some pertinent parameters that influence the dosimetric performance of synthetic diamond detectors

Cited by 6 publications

References 34 publications

The influence of defect levels on the dose rate dependence of synthetic diamond detectors of various types on exposures to high-energy radiotherapy beams

The influence of defect levels on the dose rate dependence of synthetic diamond detectors of various types on exposures to high-energy radiotherapy beams

Investigation of a synthetic diamond detector response in kilovoltage photon beams

The dose rate dependence of synthetic diamond detectors in the relative dosimetry of high-energy electron therapy beams

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