Track-Etch Neutron Radiography with a New Boron Carbide Converter

A track-etch method of neutron radiography using a new ¹⁰B₄C converter was studied. Various characteristics of the track-etch films were measured and compared with a conventional emulsion method. The etch pit production rates, resolution powers, and graininess relating to the etching conditions were precisely investigated. Various fine radiographs were obtained, including simulated fast breeder reactor fuel and irradiated fuel pins. The resolution power and the image quality of the track-etch radiography were comparable to those using a combination of gadolinium foil and fine grain films with shorter exposure times.