A battery assembly with a housing that contains a removable battery pack. The first and second terminal electrodes are disposed on an external surface extending in a direction parallel to a laminating direction of the insulator layers, among external surfaces of the capacitor element body. The integrated circuits and the substrates are at least partially encapsulated in a molding material. Also, if the document is not placed correctly or a degree of an image distortion is not within a correctable range, an alarm is issued. Each of the radiation members comprises at least two post-shaped conductors each having a length slightly less than one-quarter wavelength of a central frequency of each operating frequency so as to form a choke and the radiation members of multi-frequency, and enable the operating frequencies not to be harmonically related. The X-ray detector then performs a number of scrubs.