A sensored irradiation capsule is designed to fit inside of an irradiation basket. It is cylindrical in shape with an interior diameter of 2.25” and an overall usable height of 19”. The centerline of the fuel and vertical location of the maximum flux at full power are both within this usable volume. A set of ears provides reproducible positioning within a basket. Port can allow for various gas flows or evacuation of the capsule and watertight wire feeds can allow various power and instrumentation wiring enter and leave the capsule.