A file management method for reducing a seek operation to a minimum even when a UDF file system is used is provided. The solar power cell manager includes an input stage for combining current draws from the photovoltaic cells, and a load manager in communication with the input stage for managing the combined current draw. The adjacent protrusions are arranged at a pitch below a diffraction limit for the wavelength of the light emitted by the scintillator. The damper is varied in shape more freely than conventional flat dampers. The die includes a first via extending through the entire thickness of the die and a first via electrode disposed inside the via electrically connecting an electrode at a top surface of the die with another electrode disposed at a bottom surface of the die.