Radiation imaging apparatus and radiation imaging system

A radiation imaging system, comprising:

• a radiation imaging apparatus including:
• a first conversion element arranged to convert a radiation ray into electric charge in order to obtain a radiographic image;
• a first amplifier arranged to output a voltage corresponding to the electric charge of the first conversion element;
• a second conversion element arranged to convert the radiation ray into electric charge in order to detect radiation irradiation;
• a second amplifier arranged to output a voltage corresponding to the electric charge of the second conversion element;
• and
• a control circuit configured to control the first amplifier and the second amplifier,
• wherein the control circuit is capable of controlling the second amplifier independently of control that is exerted over the first amplifier;
• and
• a radiation generating apparatus arranged to irradiate with the radiation ray.