Abstract
The relative intensities of gamma-rays from the decay of 77.3 d 56Co have been carefully determined using a high-resolution Ge(Li)NaI(Tl) Compton suppression spectrometer. Pure cascade sources were mainly employed for the efficiency calibration. The effect of Compton back-scattering was taken into consideration for the peak area determination. The results obtained were mostly in agreement with the data published so far except for a significant discrepancy in several gamma-ray components. The discrepancy is thought to be due to the Compton back-scattering effect neglected in the previous works.
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