Patent Number: 
Section: claims

1. An apparatus for imaging a first material of a device, the device comprising said first material and a second material, said apparatus comprising: a source of x-rays;  a filter for receiving x-rays from the source of x-rays and allowing transmission of x-rays therethrough to the device;  the filter material having an atomic number greater than the atomic number of the first material; and  an x-ray detector for receiving x-rays from the device. 2. The apparatus of  claim 1  wherein the second material is semiconductor material. claim 1 3. The apparatus of  claim 2  wherein the semiconductor material comprises silicon. claim 2 4. The apparatus of  claim 3  wherein the silicon contains an active region. claim 3 5. The apparatus of  claim 4  wherein the first material comprises copper. claim 4 6. The apparatus of  claim 5  wherein the filter material has an atomic number in the range of from 30 to 35 inclusively. claim 5 7. The apparatus of  claim 6  wherein the filter material comprises zinc. claim 6 8. An apparatus for imaging a first material of a device, the device comprising copper and a second material, said apparatus comprising: a source of x-rays;  a filter for receiving x-rays from the source of x-rays and allowing transmission of x-rays therethrough to the device;  the filter material having an atomic number greater than the atomic number of copper; and  an x-ray detector for receiving x-rays from the device. 9. The apparatus of  claim 8  wherein the second material comprises silicon. claim 8 10. The apparatus of  claim 9  wherein the silicon contains an active region. claim 9 11. The apparatus of  claim 10  wherein the filter material has an atomic number in the range of from 30 to 35 inclusively. claim 10 12. The apparatus of  claim 11  wherein the filter material comprises zinc. claim 11 13. The apparatus of  claim 12  wherein the device comprises a third material comprising lead. claim 12 14. The apparatus of  claim 12  wherein the device comprises a third material comprising tin. claim 12 15. The apparatus of  claim 12  wherein the device comprises a third material comprising a lead/tin mixture. claim 12