DEVELOPMENT OF TRIPLE FISSION TECHNIQUE FOR SIMULATING FUSION NEUTRON-IRRADIATION

Fusion relevant helium generation can be realized by a technique calle d 'triple fission method'. This is essentially an injector-foil techni que where the specimen is sandwiched with a pair of foils of fissionab le material, e.g. uranium. Energetic alpha particles emitted in a smal l fraction of fission reactions are injected to adjacent specimens. Th is technique has been applied for the first time to the irradiation of a reduced activation ferritic steel developed for fusion applications . The results of the first experiment performed in the JMTR is reporte d in this paper. It is concluded that this technique is useful for sim ulating helium effects in ferritic steels where other simulation techn iques are not easily applicable.