Radioactive wastes selecting device and selection method therefor

A captured γ-ray analyzer and a fluorescent X-ray analyzer are disposed in series. The captured γ-ray analyzer is constituted with a Ge detector and a neutron source. The fluorescent X-ray analyzer is constituted with an X-ray generator and an X-ray detector. For the analysis of captured γ-rays by irradiation of thermal neutrons, saturation caused by radiation rays from the radioactive wastes themselves is mitigated by a light element filter and a collimater. The fluorescent X-ray analysis is performed by a memory router in synchronization with the modulation of radiation source for the back ground correction. Radioactive wastes in the form of a plate are transferred while being loaded on a roller conveyor. Signal pulses measured by the Ge detector and the X-ray detector are stored in the form of an energy spectrum in a process memory by way of an amplifier and an AD convertor. Then, a photoelectronic peak counting rates are calculated respectively by a computer and they are inputted to an alarm generating circuit. (I.N.)