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This chart presents: (i) the scale of the natural radiation dose per year as well as the limit of radiation dose permitted for radiation workers, police, and fire fighters who engage in disaster prevention among other specialised workers; (ii) a map of the natural doses of radiation in Japan; (iii) two charts comparing the annual doses per person received from nature and man-made source of radiation in Japan and the in the world; (iv) a diagram describing the effects of radioactivity to the human body; (v) a scale of acute radiation impacts; (vi) a guideline on control measures concerning nuclear disaster prevention; and (vii) an illustrated explanation of radioactivity and radiation and related units.