Very Fast and Primingless Single-Crystal-Diamond X-Ray Dosimeters.

X-ray dosimeters were developed by tailoring novel injecting diamond-like-carbon/Pt/Au contacts on single-crystal high-purity diamond films. A dark resistivity of (\5.6 \pm \0.1) \times \10^14\ \Omega \cdot \cm and no appreciable presence of deep traps in the bandgap confirmed a very low defect density in the diamond films. The dosimeters resulted to be primingless (i.e., no need of preactivation) and characterized by high sensitivity [( \58.20 \pm \3.26) \times \10^-3\ \C \cdot \Gy^-1 \cdot \cm^-3] and linear response to X-ray dose rate, produced by a molybdenum target. Transient X-ray modulated analysis allowed the determination of fast-trap influence and the estimation of very fast response times (\sim\!\! \10^-3\ \s), at electric fields \geq \3 \times \10^3\ \V/cm. [ABSTRACT FROM AUTHOR]