Temporal response of CVD diamond detectors to modulated low energy X-ray beams

Metal–diamond–metal vertical structures were realized and tested under a modulated 8.06 keV X-ray beam. AC photocurrent versus applied voltage curves were used to evaluate the mobility-lifetime product of collected charges whereas the density of states was achieved from the modulated photocurrent in the 7–900 Hz range. The influence of the modulation frequency and electric field strength on the device performance is discussed in the framework of multi-trapping carriers transport

A preliminary dosimetric characterization of chemical vapor deposition diamond detector prototypes in photon and electron radiotherapy beams

Three radiation detectors based on polycrystalline diamond films with different thickness and resistivity, obtained by microwave chemical vapor deposition, were tested to assess their suitability for relative dosimetry of photon and electron beams supplied by clinical linear accelerators. All samples showed a linear response as a function of the absorbed dose. The sensitivity per unit of detector sensitive volume spanned between 7 and 43 nC Gy−1 mm−3 with an applied electric field of 40 kV/cm. The dose rate dependence was evaluated following the Fowler theory and D coefficient values between 0.95 and 1.00 were found for the three samples when polarized at 40 kV/cm. Percentage depth dose curves, output factors, and normalized dose profiles were determined for 6 and 10 MV photon beams and for 6 and 15 MeV electron beams. The results obtained with the diamond detectors were in good agreement with those obtained by reference detector measurements fall the data were within the experimental uncertainty of 1% s1sdg