A radiation detecting cassette comprising: a radiation conversion panel adapted to detect radiation that has passed through a subject and converting the detected radiation into radiographic image information; wireless communicating means adapted to perform wireless communications with an external circuit; wireless communications control means adapted to control the wireless communicating means; exposure detecting means adapted to detect application of the radiation to the radiation conversion panel and outputting a detected result as an exposure detection signal to the wireless communications control means; conversion detecting means adapted to detect conversion into the radiographic image information by the radiation conversion panel and outputting a detected result as a conversion detection signal to the wireless communications control means; and a power supply adapted to energise the radiation conversion panel, the exposure detecting means, the conversion detecting means, the wireless communicating means, and the wireless communications control means, wherein the wireless communications control means is configured to control the wireless communicating means so as to inhibit supply by way of the wireless communications, of electric power from said external circuit to the power supply based on the exposure detection signal from the exposure detecting means and/or based on the conversion detection signal from the conversion detecting means and to inhibit transmission by way of the wireless communications, of the radiographic image information to an external circuit by way of the wireless communications based on the conversion detection signal from the conversion detecting means. a radiation conversion panel adapted to detect radiation that has passed through a subject and converting the detected radiation into radiographic image information; wireless communicating means adapted to perform wireless communications with an external circuit; wireless communications control means adapted to control the wireless communicating means; exposure detecting means adapted to detect application of the radiation to the radiation conversion panel and outputting a detected result as an exposure detection signal to the wireless communications control means; conversion detecting means adapted to detect conversion into the radiographic image information by the radiation conversion panel and outputting a detected result as a conversion detection signal to the wireless communications control means; and a power supply adapted to energise the radiation conversion panel, the exposure detecting means, the conversion detecting means, the wireless communicating means, and the wireless communications control means, wherein the wireless communications control means is configured to control the wireless communicating means so as to inhibit supply by way of the wireless communications, of electric power from said external circuit to the power supply based on the exposure detection signal from the exposure detecting means and/or based on the conversion detection signal from the conversion detecting means and to inhibit transmission by way of the wireless communications, of the radiographic image information to an external circuit by way of the wireless communications based on the conversion detection signal from the conversion detecting means.