A device for generating x-rays has an enclosing vessel having a structure suitable to provide an enclosed space at a predetermined fluid pressure, wherein the enclosing vessel has a window portion and a shielding portion in which the shielding portion is more optically dense to x-rays than the window portion; a mechanoluminescent component disposed at least partially within the enclosing vessel; and a mechanical assembly connected to the mechanoluminescent component. The mechanical assembly provides mechanical energy to the mechanoluminescent component while in operation, and at least some of the mechanical energy when provided to the mechanoluminescent component by the mechanical assembly is converted to x-rays.