To efficiently erase radioactive ray energy remaining in an accumulative phosphor sheet used for radiography in a radiographic system.

The radiographic system 200 carries out radiographing several times by alternately repeating the exposure of the same accumulative phosphor sheet 1 with radioactive rays by a radioactive ray exposure part 10 and erasure by the application of erasing energy by an erasing unit 100. When a determination means 65 determines that high sensitive photographing is to be carried out subsequent to regular sensitive photographing, an additional erasing energy setting part 70 determines an amount of erasing energy applied for additional erasure from a maximum amount of exposure with radioactive rays detected by a maximum exposure amount detection part 55 and from the sensitivity of high sensitive photographing obtained by a sensitivity acquiring part 60. An erasure control part 75 controls an erasing energy application part 50. Then, the erasing energy whose intensity is determined by the additional erasure energy setting part 70 is applied to the accumulative phosphor sheet 1. Thus, the additional erasure is performed.