Microchannel plate (MCP) is a device of two-dimension array electronic multiplier. The detection ability to 40～60keV X-ray for MCP was increased by coating the halide such as CsI

CsBr and KBr on input plate of MCP

that forming a reflection X-ray sensitive film in the channel with depth of 2～3 times of diameter below the input plate. Experiment results shown that the output response of MCP with variable density structure of CsI for X-ray is about 5～6 times higher than that with constant density structure

and of one order of magnitude stronger than that without coating the film. Comparatively

the output response of MCP with CsI sensing film is best

but CsBr and KBr medium are not. The response characteristics of MCP with CsI for X-ray related to film materials

structure

component distribution and fabrication process. Several experiment curves denoted the response characteristics to X-ray at different target voltage and current. The results basically accorded with the theory about quantum detection efficiency of reflection X-ray cathode. This new MCP reflection X-ray sensitive film of variable density halide has been successfully applied on X-ray imaging detecting devices. The corresponding detection system will find widely and potential applications in the field of medical diagnosis

nondestructive evaluation and security inspection etc.