The present invention has an object to provide a photoelectric conversion device which can be manufactured through a simple manufacturing process, achieve photoelectric conversion over a wide range of wavelength regions, and attain high photoelectric conversion efficiency even in the infrared wavelength region, a photodetection device, and a photodetection method. Based at least partially on projection data generated during the initial radiographic scan, at least one location within the container is identified that requires CT inspection. The apparatus further comprises a digital controller to generate a first signal for instructing the voltage regulator to adjust a voltage level of the adjustable power supply. Each propulsion unit includes at least one tractor propeller, and at least one propulsion unit has two propellers on the same axis, each of said propellers rotating about an axis of rotation that is offset transversely from said anteroposterior plane of symmetry. A solid state water presence sensor apparatus can also be used to determine the presence of water within the heater housing, providing electrical water presence signals to the controller indicative of the presence or absence of a body of water within the heater housing.