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, Nicholas; Nam, T.L.

doi:10.1016/j.radphyschem.2014.11.016

Cited by 7 publications

(3 citation statements)

References 47 publications

(61 reference statements)

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“…4(b)). It is known from the literature on ionizing radiation detectors based on wide-bandgap semiconductors 43 that the value of Δ is strongly influenced by the presence of defects, the role of which in the dynamics of X-ray photogenerated charge transport is in turn significantly dependent on the intensity of the applied electric field. Indeed, when defects cause trapping of the photogenerated carriers, charge collection efficiency unavoidably decreases, unless the applied electric field is intense enough to induce detrapping, thus compensating for the temporary signal loss.…”

Section: Resultsmentioning

confidence: 99%

Orthorhombic undoped κ-Ga₂O₃ epitaxial thin films for sensitive, fast, and stable direct X-ray detectors

et al. 2023

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Section: Resultsmentioning

confidence: 99%

Orthorhombic undoped κ-Ga₂O₃ epitaxial thin films for sensitive, fast, and stable direct X-ray detectors

et al. 2023

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“…The effect of impurities on the recombination in diamond detectors has been widely studied (Guerrero et al 2005, Ade and Nam 2015a, Balducci et al 2006. Shallow traps that are unstable at room temperature could potentially cause a PRF dependence if the decay time were similar to the pulse repetition period.…”

Section: Recombination In the Microdiamond Detector: Prf Dependencementioning

confidence: 99%

Dose rate dependence of the PTW 60019 microDiamond detector in high dose-per-pulse pulsed beams

et al. 2015

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Recombination effects can affect the detectors used for the dosimetry of radiotherapy fields. They are important when using ionization chambers, especially in liquid-filled ionization chambers, and should be corrected for. The introduction of flattening-filter-free accelerators increases the typical dose-per-pulse used in radiotherapy beams, which leads to more important recombination effects. Diamond detectors provide a good solution for the dosimetry and quality assurance of small radiotherapy fields, due to their low energy dependence and small volume. The group of Università di Roma Tor Vergata has developed a synthetic diamond detector, which is commercialized by PTW as microDiamond detector type 60019. In this work we present an experimental characterization of the collection efficiency of the microDiamond detector, focusing on high dose-per-pulse FFF beams. The collection efficiency decreases with dose-per-pulse, down to 0.978 at 2.2 mGy/pulse, following a Fowler-Attix-like curve. On the other hand, we have found no significant dependence of the collection efficiency on the pulse repetition frequency (or pulse period).

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“…In the literature, 28 ∆ generally has values between 0.49 and 1.16. There is a controversy whether ∆ varies as a function of the external bias, and of the energy and type of ionizing radiation (Ade and Nam 2015).…”

Section: Effects Of Accumulated Dose and Dose Ratementioning

confidence: 99%

Semiconductor dosimetry in modern external-beam radiation therapy

et al. 2020

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Semiconductor dosimeters are ubiquitous in modern external-beam radiation therapy. They possess key features. The response, electronically available in real time, is stable and linear with absorbed dose for given irradiation conditions; the radiation-sensitive volume can be rather small in size, while retaining mechanical strength and high sensitivity. We describe three common semiconductor dosimeters: diodes, metal-oxide-semiconductor field-effect transistors and diamonds. We discuss in detail their operation principles and applications in modern external-beam radiation therapy, primarily with megavoltage photon beams. We also explore their use in proton and heavy ion therapy, and in experimental radiotherapy techniques such as synchrotron-based micro-beam radiation therapy.

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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

Cited by 7 publications

References 47 publications

Orthorhombic undoped κ-Ga₂O₃ epitaxial thin films for sensitive, fast, and stable direct X-ray detectors

Orthorhombic undoped κ-Ga₂O₃ epitaxial thin films for sensitive, fast, and stable direct X-ray detectors

Dose rate dependence of the PTW 60019 microDiamond detector in high dose-per-pulse pulsed beams

Semiconductor dosimetry in modern external-beam radiation therapy

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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

Cited by 7 publications

References 47 publications

Orthorhombic undoped κ-Ga2O3 epitaxial thin films for sensitive, fast, and stable direct X-ray detectors

Orthorhombic undoped κ-Ga2O3 epitaxial thin films for sensitive, fast, and stable direct X-ray detectors

Dose rate dependence of the PTW 60019 microDiamond detector in high dose-per-pulse pulsed beams

Semiconductor dosimetry in modern external-beam radiation therapy

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Product

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Orthorhombic undoped κ-Ga₂O₃ epitaxial thin films for sensitive, fast, and stable direct X-ray detectors

Orthorhombic undoped κ-Ga₂O₃ epitaxial thin films for sensitive, fast, and stable direct X-ray detectors