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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 ...

PamelaLan
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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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