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Disintegration rate and gamma ray probability per decay measurement of 166mHo

The procedure followed by the Nuclear Metrology Laboratory (Laboratorio de Metrologia Nuclear — LMN) at the IPEN-CNEN/SP, in São Paulo, for the standardization in a 4πβ-γ coincidence system and the determination of gamma ray emission probabilities per decay of 166mHo are described. The standardization by means of a 4πβ-γ system was performed selecting two γ-ray windows: one set at the 184 keV total absorption peak and another one covering 700–830 keV energy range, both following β-decay processes. The 166mHo sources were also measured in a ReGe spectrometer previously calibrated with standard sources of 241Am, 133Ba, 57Co, 60Co, 152Eu and 54Mn standardized in the 4πβ-γ coincidence system. The experimental results were compared with data from literature.