Patent ID: 7637858

Claim:
A functional sheet comprising: a photocatalyst powder in which a metal powder exercising a photocatalyst function by oxidation is oxidized, said photocatalyst powder having a structure of which a bond with oxygen is decreased as it goes from the surface of the powder to the inside gradually; a radioactive powder containing a natural radioactive substance; a carrier formed in a sheet shape composed by entangling a lot of fibers to a level at which air permeability can be secured, said fibers entangled with permeability sufficient to pass air but not to pass said photocatalyst powder and said radioactive powder said carrier having a laminated structure to and supporting said photocatalyst powder and said radioactive powder by placing the powders between the laminated structure of said carrier in a condition in which the powders are mutually brought in contact or adjacent; and said photocatalyst powder being obtained by injecting and bombarding said metal powder on an object to be bombarded comprising metal, ceramics, or a mixture thereof which has a melting point equal or more to a melting point of the metal powder, together with compressed gas.