Discriminated neutron and X-ray radiography using multi-color scintillation detector

A new conversion screen Gd2O2S:Eu is developed, which emits red light on irradiation by thermal neutrons. By applying this in combination with the currently used Gd2O2S:Tb, a green-light scintillator, in the radiography under a neutron + X-ray coexisting field, we can easily separate the neutron image and the X-ray image by simple color-image processing. This technique enables a non-destructive and detailed inspection of industrial products composed both of light elements (water, plastics, etc.) and heavy elements (metals), widening the horizon of new applications.