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SiC and Diamond dosimetry for radiotherapy applications

Dosimetric performance of CVD diamond films significantly improved by a pre ... The absolute sensitivity of the diamond device is quite the highest one, while ...

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SiC and Diamond dosimetry for radiotherapy applications

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    IRRADIATION FACILITY Radiotherapy Unit - Clinical Fisiopathology Department - Florence RESMDD02 July 10-12, 2002 Florence 22 MeV electrons from linear accelerator dose-rates: 0.5-4 Gy/min 6 MV photons from linear accelerator dose-rates: 2-10Gy/min ?-radiation from Co60 source dose-rates .1-.3Gy/min

    SiC diode and diamond devices can be embedded in tissue equivalent epoxy resin to avoid the contribution of air to the signal response

    Characteristics of a Schottky contact Dark current Direct current Capacity Depletion depth Resistance Dark current of the SiC dosimeter embedded in the epoxy resin and placed in the PMMA finger before irradiation RESMDD02 July 10-12, 2002 Florence Stable signal - High signal/noise - no priming effects RESMDD02 July 10-12, 2002 Florence Vrev = 150 Volt Isignal ~ 1nA Idark ~0.1pA Released charge vs absorbed dose Co60 g dose rate = 0.21Gy/min Vrev = 0 Volt Sensitivity = 14.1 nC/Gy IV characteristics during Co60 g-irradiation The current response depends on the square root of the reverse voltage The signal depends linearly on the dose-rate. Device sensitivity: ?slope of the linear fit RESMDD02 July 10-12, 2002 Florence

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