Abstract: A composition analysis device includes a first detection sensor that identifies gamma rays, a second detection sensor that identifies the gamma rays, and a detection controller. The first detection sensor and the second detection sensor may detect gamma rays emitted by a target object, and transmit, to the detection controller, first gamma-ray information and second gamma-ray information respectively. The detection controller may transmit the first gamma-ray information, to an information analysis device when the detection control identifies that the first gamma-ray information has been transmitted, and transmit the second gamma-ray information, to the information analysis device when the detection control does not identify that the first gamma-ray information has been transmitted and the detection control identifies that the second gamma-ray information has been transmitted.