PENUMBRAL IMAGING OF X-RAYS AND NEUTRONS

Penumbral imaging [1] is a highly sensitive coded aperture imaging technique which uses the fact that spatial information can be recovered from the shadow or penumbra that an unknown source casts of a simple large circular aperture. Since such an aperture can be “drilled” through a substrate of almost any thickness, the technique can easily be applied to very penetrating radiation, such as hard x-rays or neutrons.