放射線照射Fe-Cr-Ni合金中の水素挙動観察へのトリチウムトレーサの利用方法

Investigation using the tritium tracer technique clarified that hydrogen formed by radiolysis of radiation-damaged internal reactor components and reactor coolant feedwater and hydrogen injected into reactor coolant feedwater have compatibility. Radiation-damaged Fe-Cr-Ni alloy was covered with photographic emulsion, and β-rays from tritium trapped in the radiation-damaged Fe-Cr-Ni alloy produce Ag-clusters. Energy dispersive X-ray analyzer (EDX) and transmission electron microscope (TEM) were used to confirm the presence of Ag-clusters and investigate tritium behavior. The trapping of tritium atoms in Fe-Cr-Ni alloys bombarded with Ni2+ at 563 K was proved by TEM autoradiography procedure. The trapping of tritium atoms occurs at grain boundaries, voids, twins, and slip bands.