RADIATION IMAGE CAPTURING APPARATUS AND RADIATION IMAGE CAPTURING SYSTEM

A radiation image capturing apparatus (300) is provided. The apparatus comprises an image capturing unit (100) configured to acquire a radiation image, the image capturing unit (100) being provided with a plurality of receptor fields (A~C, K~O) for acquiring irradiation information of radiation concerning an integrated dose of radiation entering during irradiation with radiation, and a selection unit (406) configured to select a receptor field, of the plurality of receptor fields (A~C, K~O), which is used by a user. The selection unit (406) changes an upper limit of the number of receptor fields, of the plurality of receptor fields (A~C, K~O), which are used for one image capturing operation depending on when the radiation image capturing apparatus (300) is attached to a stand to which the radiation image capturing apparatus (300) can be attached and when the radiation image capturing apparatus (300) is detached from the stand.