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Our experience with various honeycomb panel manufacturers allows us to apply our application know-how. Whether Carbon/Nomex or Metallic honeycomb construction, the adhesive/braze meniscus forms during cure or reflow as a part of the process. In simulations of either material, we can clearly detect the meniscus formation but only when the honeycomb structure is oriented in such a way so as to allow the viewing of both bonding edges in question, and without interference by other walls or structures.
This sample has a wide array of different indications which include totally open, partial and fully reflowed braze joints. In some cases, the reflowed braze material is seen on the surfaces of both skins as well as on the corrugated honeycomb structure.
Since x-rays emanate from a point source within the x-ray tube, we have to consider the geometry of the honeycomb panel and its overall construction/structure. This honeycomb formation is actually quadratic (not a hexagonal formation), meaning the run-lines are perpendicular and occur on two axes, X and Y. Since the honeycomb can be shallow, down to 0.250", the effects of geometric distortion are relatively small albeit significant enough to disallow area image formation and analysis over a reasonably large area.
The 2-D sketch below shows this effect in one axis.
Angular distortion caused by emergent beam angle - equally in all directions. The red areas are apparent thickness of thin lines. This effect increases from the center outward.