Patent ID: 6320303
Filing Date: 2001-11-20
Classification: H01J

Abstract:
A radioactive-ray image tube comprising:a vacuum vessel having one side serving as a radioactive-ray input window on which radioactive-rays are incident;an input screen for converting a radioactive-ray image formed by said incident radioactive-rays into a fluorescent image and a photo-electron image;an input substrate having the input screen deposited onto one surface thereof; andan output screen provided on the other side of the vacuum vessel, and wherein the input substrate is formed of a clad material provided by rolling and cladding an aluminum alloy material on the radioactive-ray incidence side with a pure aluminum plate on the side onto which the input screen is deposited; andwherein the clad material for constituting the input substrate has a thickness ratio (Ta:Tb) of a thickness (Ta) of the aluminum alloy material to a thickness (Tb) of the pure aluminum plate falling within a range of (1:2) to (80:1).