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 ± 0.1) × 10¹⁴ Ω · 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 ± 3.26) × 10^-3 C · Gy^-1 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 (~10^-3 s), at electric fields ≥ 3 × 10³ V/cm.