Abstract
A commercial liquid-scintillation system and calibrated germanium gamma-ray spectrometers were used to confirm the use of the 159-keV gamma ray of 123mTe as a primary efficiency calibrant for which the activity measurement is simple. The evaluated gamma-ray probability per decay is 0.840 ± 0.004. Liquid-scintillation spectra confirm that conversion electrons greater than 50 keV can be detected in at least 99.5% of the decays. The half-life was measured as 119.2 ± 0.1 days.
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