Patent ID: 7592601

Claim:
A method of fabricating a neutron detection device, comprising: pulverizing neutron reactive material to provide granules that have a high packing density when filling elongated tube cavities in an active region of a neutron detection semiconductor device, wherein a center to center distance between each elongated tube is between 5 and 20 microns; bringing to a common electric potential the pulverized neutron reactive material, and a semiconductor wafer including elongated tube cavities extending from respective openings in a surface of an active region of a neutron detection semiconductor device being fabricated on the semiconductor wafer and continuing almost through, but not totally through, the active region, wherein the active region exhibits an internal electric field causing free charges to separate and drift across the active region; and while maintaining the pulverized neutron reactive material and the semiconductor wafer at the common electric potential, filling the elongated tube cavities to a high packing density with the pulverized neutron reactive material.