According to API RP 571 and API RP 583 (CUI-specific guidance):
“Neutron backscatter techniques are effective in detecting moisture within insulation systems, which can indicate areas of concern for corrosion under insulation (CUI).”
“This method provides non-invasive, quick identification of wet insulation without removing cladding.”
(Reference: API RP 571, Section 4.5.1 – Corrosion Under Insulation and API RP 583 – CUI Detection Techniques)
Thus, neutron backscatter is the preferred NDE method for moisture detection, making option B correct.
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