A transceiver of a radiation detecting cassette receives subject ID information from an RFID tag by way of wireless communications. An ID checker checks the subject ID information received by the transceiver against a plurality of subject ID information stored in an RFID memory. If the subject ID information received by the transceiver matches one of the subject ID information stored in the RFID memory, then the ID checker associates the matching subject ID information with a radiation dose that is stored in a dose storage unit and corresponds to the matching subject ID information.