Radiography system

A radiography system for imaging a subject, comprising:

• a radiation generation apparatus;
• an electronic cassette;
• a first position detection mechanism that includes an optical camera that is provided in the radiation generation apparatus and capable of imaging the electronic cassette, and detects a position of the electronic cassette based on a camera image captured by the optical camera;
• a second position detection mechanism that includes a generator that generates a non-optical signal and a sensor that detects the non-optical signal, in which one of the generator and the sensor is provided in the radiation generation apparatus and the other is provided in the electronic cassette, and detects a position of the electronic cassette based on the non-optical signal;
• and
• a processor that is configured to execute control of outputting a detection result of at least one of the first position detection mechanism or the second position detection mechanism.