Transmission type target, radiation generating tube including the same, radiation generating apparatus, and radiography system

1. A method for producing a transmission type target, the method comprising:

a target layer formation step of forming a target layer configured to generate an X-ray upon irradiation with electrons; and

a sp2 bond formation step of forming a carbon-containing region comprising sp2 bonds in a diamond substrate, wherein the carbon-containing region is formed from a part of diamond in the diamond substrate, wherein the carbon-containing region is between the target layer and regions of the diamond substrate that are not the carbon-containing region,

wherein the target layer formation step includes a step of forming a metal layer on one surface of the diamond substrate, the metal layer comprising a target metal, and

the sp2 bond formation step includes a heating step of heating at least the diamond substrate so as to convert at least some of sp3 bonds contained in the surface of the diamond substrate into sp2 bonds, and

wherein the heating step is performed before the step of forming a metal layer.

2. The method according to claim 1 , wherein the heating step is performed under a vacuum environment or an inert gas atmosphere.

3. The method according to claim 1 , wherein the heating step is performed at a temperature of 650° C. or higher and 2000° C. or lower.

4. The method according to claim 1 , wherein the sp2 bond formation step is performed by forming a carbon-containing layer comprising sp2 bonds on one surface of the diamond substrate.