QUANTITATIVE MEASURING METHOD FOR CORROSION AND MOISTURE IN METALLIC STRUCTURE MEMBER

摘要

PURPOSE:To execute the quantitative measurement of corrosion of a mating face of a multi-layer structure member and moisture in a honeycomb by irradiating a film with a neutron beam, and photographing a neutron radiography image and an indicator image on a film, and comparing both the images. CONSTITUTION:By using a neutron source 1, a body 3 to be inspected is irradiated with a neutron beam 2, the degree of attenuation of the neutron beam caused by a step wedge 5 made of polyethylene placed on the body to be inspected and corrosion, etc., (containing moisture in a honeycomb) 4 is insert- photographed in a film through a conversion foil 6, and an N-Ray film 10 is obtained. In this film 10, a step area of an indicator image 9 made of polyethylene whose density is equal to film density of an area of a neutron radiography image 11 generated by corrosion or moisture in the honeycomb, etc., is investigated. In such a way, since thickness of polyethylene in the indicator step area of equal density is known, the quantitative measurement of corrosion or moisture is executed.