A data storage methodology wherein a hashing algorithm is applied to break a directory object experiencing frequent concurrent accesses from a number of client or manager applications into a predetermined number of hash component objects and a hash master object that manages the component objects. The control unit includes a display image generator for generating a display image, a display panel and a control unit-side controller having a function of presenting the display image based on the image data input in a preview representation and an output processing function of implementing an output process. Each of the analysis modes is for quantitatively analyzing different biochemical substance. The detector can also conserve power by automatically shutting off the unused measurement channel and still give a personal safety warning when the radiation rate or the dose reaches respective alarm thresholds. The invention optimizes between the first solution and the second solution. In a second direction, a length of the second conductive portion is larger than a length of the first conductive portion.