Patent Number: 
Section: claims

1. A radiation window membrane for covering an opening in an X-ray device, through which opening X-rays are to pass, the membrane comprising:a window base layer, anda pinhole-blocking layer on a surface of said window base layer;wherein said pinhole-blocking layer comprises graphene. 2. A radiation window membrane according to claim 1, wherein said pinhole-blocking layer is electrically conductive. 3. A radiation window membrane according to claim 1, wherein said window base layer comprises at least one of: aluminium oxide, aluminium nitride, titanium oxide, silicon nitride. 4. A radiation window membrane according to claim 3, comprising a patterned layer on one side of said pinhole-blocking layer, wherein said patterned layer is one of the following: a patterned copper layer, a patterned nickel layer, a patterned iridium layer, a patterned ruthenium layer. 5. A radiation window membrane according to claim 4, wherein said pinhole-blocking layer is on one side of said patterned layer, and the radiation window membrane comprises a patterned substrate on another side of said patterned layer. 6. A radiation window membrane according to claim 3, comprising an etch stop layer on a different side of said window base layer than said pinhole-blocking layer. 7. A radiation window membrane according to claim 1, wherein the radiation window membrane comprises additionally a support layer, which is one of: a continuous polymer film, a support mesh made of polymer, a support mesh made of metal. 8. A method for manufacturing a radiation window membrane for covering an opening in an X-ray device, through which opening X-rays are to pass, the method comprising:attaching a pinhole-blocking layer to a window base layer;wherein said pinhole-blocking layer comprises graphene. 9. A method according to claim 8, comprising:using a thin film manufacturing technique to produce a graphene layer on an etchable support layer, wherein said graphene layer constitutes said pinhole-blocking layer,using a thin film manufacturing technique to produce a window base layer on said graphene layer, andetching through said etchable support layer to leave a patterned support layer on one side of said graphene layer. 10. A method according to claim 9, comprising:before producing the graphene layer, using a thin film manufacturing technique to produce said etchable support layer on an etchable substrate layer, andin said etching step, etching through both the etchable substrate layer and said etchable support layer. 11. A method according to claim 8, comprising:producing a first membrane, which comprises an exposed graphene layer,producing a second membrane, which comprises an exposed window base layer, andattaching said first membrane to said second membrane, so that said exposed graphene layer becomes attached to said exposed window base layer. 12. A method according to claim 11, wherein:producing said first membrane comprises using a thin film manufacturing technique to produce said graphene layer on a first support layer, producing a second support layer on a different surface of said graphene layer than said first support layer, and removing the first support layer to expose said graphene layer. 13. A method according to claim 11, wherein:producing said second membrane comprises using a thin film manufacturing technique to produce an etch stop layer on a substrate, and using a thin film manufacturing technique to produce said window base layer on said etch stop layer. 14. A method according to claim 13, wherein:producing said first membrane comprises using a thin film manufacturing technique to produce said graphene layer on a first support layer, producing a second support layer on a different surface of said graphene layer than said first support layer, and removing the first support layer to expose said graphene layer,after attaching said first membrane to said second membrane, the method comprises removing at least part of said second support layer and at least part of said substrate.