Patent Number: 
Section: claims

1. A defect imaging device, comprising:an energy beam system having an output of photons directed at a device under test and producing a positron instantaneously by electron-positron pair production in the device under test, wherein the output has a maximum energy above an electron-positron pair production threshold but below a neutron emission threshold;a detector receiving an annihilation photon from the annihilation of the positron and determining a momentum of an electron forming an annihilation photon. 2. The device of claim 1, further including an imaging system receiving an electrical output from the detector. 3. The device of claim 1, wherein the energy beam system includes an electron accelerator having an output directed at a bremsstrahlung converter. 4. The device of claim 3, further including a collimator at an output of the bremsstrahlung converter. 5. The device of claim 1, wherein the detector is a high purity germanium detector. 6. The device of claim 5, further including a sodium iodide detector.