The CVD diamond microdosimeter is an ideal substitute for common Si and GaAs detectors under extremely strong radiation experimental environment due to its high band gap energy

fast charge collection

low dielectric constant and high hardness. In order to improve its character

a CVD diamond microdosimeter was irradiated by protons of 46 Gy

and the lateral micro-ion beam induced charge (IBIC) technique was utilized to characterize it in low beam current (~fA). It was clearly shown that charge collection efficiency was greatly improved after proton irradiation with that dose. Moreover

the uniformities of both counting performance and collection efficiency were enhanced. Proton irradiation of 46 Gy has been proved to be an effective way to prime a CVD diamond.