Radiographic intensifying screen

Claim 2

A radiographic intensifying screen including a sheet of material having at least 13 electrons per atom having one side adapted to be disposed adjacent to an electron sensitive device For providing secondarily emitted particles when said sheet is subjected to radiation, an improvement comprising: said one side having a plurality of closely spaced surface portions which are sufficiently oblique with respect to the plane of said sheet to substantially enhance the yield of secondarily emitted particles.

Claim 3

A radiographic intensifying screen of claim 1 comprising a material selected from the group consisting of lead, uranium, tantalum, tungsten, gold, silver, osmium and iridium.

Claim 4

A radiographic intensifying screen of claim 1 having surface comprising a plurality of closely-spaced grooves.

Claim 5

A radiographic intensifying screen of claim 1 having said surfaces comprising a plurality of closely-spaced indentations.

Claim 6

A radiographic intensifying screen of claim 1 and, a coating on said surface of a material which luminesces when struck by photons or electrons.

Claim 7

A radiographic intensifying screen of claim 5 wherein said coating is selected from the group consisting of calcium-tungstate, cadmium-sulfide, cesium-chloride and sodium-chloride.

Claim 8

A radiographic intensifying screen of claim 1 and, a coating on said surface comprising a material exhibiting an average secondary emission of at least one particle per particle striking or penetrating said material.

Claim 9

A radiographic intensifying screen of claim 7 wherein said coating is comprised of a material selected from the group consisting of cesium oxide reduced on a base of silver, molybdenum, copper, tungsten and silver.

Claim 10

A radiographic intensifying screen of claim 7 and, a coating on said secondary emissive material which luminesces when struck by photons or electrons.

Claim 11

A radiographic intensifying screen of claim 8 and, a coating on said secondary emissive material selected from the group consisting of calcium-tungstate, cadmium-sulfide, cesium-chloride and sodium-chloride.

Claim 12

A radiographic system comprising: a sheet of material having at least 13 electrons per atom for providing secondarily emitted particles when subjected to radiation, said sheet having one side provided with a plurality of closely spaced surface portions which are sufficiently oblique with respect to the plane of said sheet to substantially enhance the yield of secondarily emitted particles; and an electron sensitive device disposed adjacent said one side of said sheet for receiving said secondarily emitted particles.

Claim 13

A radiographic system comprising: a sheet of material having at least 13 electrons per atom for providing secondarily emitted particles when subjected to radiation, said sheet having one side provided with a plurality of closely spaced surface portions which are sufficiently oblique with respect to the plane of said sheet to substantially enhance the yield of secondarily emitted particles; and an electron sensitive device disposed adjacent said one side of said sheet for receiving said secondarily emitted particles.

Claim 14

A radiographic intensifying screen of claim 1 wherein said plurality of surface portions obliquely face said electron sensitive device.

Claim 15

A radiographic intensifying screen of claim 11 wherein said plurality of surface portions obliquely face said electron sensitive device.