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A neutron radiograph pinpoints problemsThe neutron radiograph is recorded on film similar to that used for X-rays. Unlike an X-ray, however, which can see through water but is stopped by metal, a neutron scan penetrates metal but is stopped by water and corrosion. That's enabled Egbert to find flaws that are invisible to the eye and to other systems. And, in some cases, it's allowed him to show that apparent weaknesses are, in fact, stronger than they look.
This image shows a neutron radiograph of an outlet tube from one of the retardant tanks. Pits of corrosion that have reduced the thickness of the metal are marked.