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
^166m
Ho 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
^166m
Ho sources were also measured in a ReGe spectrometer previously calibrated with standard sources of
²⁴¹
Am,
¹³³
Ba,
⁵⁷
Co,
⁶⁰
Co,
¹⁵²
Eu and
⁵⁴
Mn standardized in the 4πβ-γ coincidence system. The experimental results were compared with data from literature.