Abstract. Wheat grain of low moisture content cracks when it absorbs water or moisture from the environment. The resulting endosperm damage is detected by X-ray method. Grain samples of spring wheat cv. Henika of 10 % moisture content of different endosperm types -vitreous and mealy, were subjected to the process of moistening: in water, and in a controlled-climate chamber. The resulting internal damage was described by means of digital indexes. Analysis of results indicates that the extent of the damage is affected by both the method of moistening and the type of endosperm.