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Holmium-166m has a long half life (1200 yr) and emits a large number of γ-rays between 80 and 1400 keV. These characteristics are very suitable for γ-ray calibration sources, therefore, the absolute activity of 166m Ho was measured and several sealed sources were produced to be used as reference sources for the secondary standardization systems for γ-ray emitting nuclides. In this project,...