Absolute standardization of the ¹³³Ba by sum-peak method and comparison with other methods

This paper presents the absolute standardization of 133Ba by sum-peak method. 133Ba owns a complex decay and was used the sum coincidences between the average energy of characteristic X-rays (kα1 and kα2) and gamma-rays. The activity results presented uncertainty values below 0.3 % and were compared with those of other absolute activity measurement techniques. The results obtained are compared with other methods and confirm that this is an alternative, fast and efficient method for 133Ba standardization.