Standardization of 55Fe by tracing method

This work describes the procedure followed by the Laboratório de Metrologia Nuclear (LMN) for the standardization of 55Fe by the tracing method. This technique was applied using two radionuclides, which decay by the electron capture process followed by a prompt gamma-ray, namely 51Cr and 54Mn, as tracers. The calibration was performed in a 4πβ–γ coincidence system. The efficiency was obtained by selecting a gamma-ray window set at the 320 keV total absorption peak for 51Cr and at 834 keV for 54Mn.