▎ 摘　　要

NOVELTY - The preparation method of an ultra-thin 63 nickel radiation source involves: preparing nickel nano particles, and then dispersing the prepared nickel nano particles in an ethanol or acetone solution; preparing a polymethyl methacrylate/graphene film; placing the polymethyl methacrylate/graphene film in a magnetic field, then dripping the nickel source on the surface of the polymethyl methacrylate/graphene film, under the induction of an external magnetic field, arranging nickel nano particles in an oriented mode along the direction of a magnetic line, and removing the external magnetic field after ethanol/acetone is volatilized; and removing polymethyl methacrylate. The nickel nanoparticles are prepared by reacting 63nickel acetylacetonate and oleylamine at high temperature, precipitating, drying, and grinding. USE - Method for preparing ultra-thin 63nickel radiation source useful in the preparation of a Schottky junction type laminated beta-radiation cell (claimed). ADVANTAGE - The thickness of the 63nickel radiation source can be reduced to about 1 mu m, and the film is complete and can be self-supported (other unnecessary supporting substrates are not needed). The nano particles forming the film can realize directional arrangement under the action of an external magnetic field. The orderly-arranged self-supporting ultra-thin 63nickel-63 radiation source film has controllable orientation, is not limited by the thickness of a device, and has wide application range. The method applies the magnetic field technology to the film preparation for the first time, and provides a new direction for the preparation of the radiation source film. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for the ultra-thin 63 nickel radiation source. DESCRIPTION OF DRAWING(S) - The drawing shows a flow chart of the preparation of the ultra-thin 63 nickel radiation source film. (Drawing includes non-English language text).