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The half-lifes of  60  Co,  137  Cs and  133  Ba have been evaluated from measurements of the activities of samples against the activity of a  226  Ra-standard by means of a 4 π-γ-ionization chamber during a period of about 3 years. A least squares fit together with corrections for the decay of  226  Ra, contaminations, and saturation defects leads to the following results:

Messung der Halbwertszeiten von 60 Co, 137 Cs und 133 Ba