Radiation output device, radiography system, and radiography method

In a radiography system (10) and a radiography method, a radiation output device (18) has a plurality of radiation sources (30, 30a-30h). The plurality of radiation sources (30a-30h) output radiation (16, 16a-16h) such that the output order for the radiation (16, 16a-16h) from the plurality of radiation sources (30, 30a-30h) does not become those next to each other.