NONDESTRUCTIVE INSPECTION METHOD

To provide a nondestructive inspection method capable of more accurately evaluating deterioration of a measurement object than before on the basis of moisture contained in the measurement object.SOLUTION: A nondestructive inspection method includes: a water absorption/drying step for changing a moisture state of a sample; a transmission image capturing step for applying a radiation to the sample which has absorbed water and been dried for a predetermined period in the water absorption/drying step, so as to capture a transmission image visualizing the radiation transmitted by the sample; and an evaluation step for evaluating the sample on the basis of the moisture state of the sample, which can be read from the transmission image captured in the transmission image capturing step.SELECTED DRAWING: Figure 2 【課題】被測定物の含有する水分に基づいて、より正確に被測定物の劣化を評価することができる非破壊検査方法を提供すること。【解決手段】供試体の含水状態を変化させる吸水・乾燥工程と、吸水・乾燥工程にて所定時間吸水・乾燥させた供試体に放射線を照射し、当該供試体を透過した放射線を可視化した透過画像を撮影する透過画像撮影工程と、透過画像撮影工程にて撮影した透過画像から読み取れる供試体の含水状態に基づいて供試体の評価する評価工程と、を備える。【選択図】図２