Absolute activity measurement of 152Eu sources with a single detector

We investigated the possibility of absolute source activity measurements by a single gamma spectrometer. The measurements were performed for three (point, cylinder and Marinelly shaped) calibrated 152Eu sources. Making use of data on peak, sum-peak and total spectrum area in the single spectrum, we developed the activity determination method based on the dominant gamma cascades in the 152Eu decay. We have shown that spectral data of 152Eu point and Marinelli shaped source can yield activity information with uncertainty below 10%. - Highlights: → Peak, sum-peak and total spectrum area in single spectrum were used for activity determination. → For the 152Eu source the activity was determined from the dominant gamma cascades in the decay. → The activity of point and Marinelly shaped sources was determined with uncertainty of less than 10%.