In this study, nondestructive observations of naturally occurring methane hydrates were performed by means of absorption-contrast X-ray computed tomography (CT) with monochromated synchrotron X-rays at a temperature below 120K. The X-ray CT technique using X-ray of 15keV enabled measurments of the methane hydrate coexisting with sediments. However, segmentation between the hydrate and ice can not be achieved.
