Abstract
The intensities of the γ transitions per α decay in the energy interval between 50 keV and 325 keV have been accurately measured. Two main methods have been used for this purpose, according to the different nuclide to be studied: comparison between direct α and γ ray spectrum ( 241Am and 227Th) and bidimensional α-γ coincidence spectra ( 230U, 228Th and 226Th). With this latest method several internal conversion coefficients were measured and found in good agreement with the Pauli's tables. In other cases where the γ-rays are very weakly converted ( 222Ra and 224Ra) an indirect method was used for determining the γ-intensities using the theoretical values contained in the previous tables. With this set of γ-emitters it becomes possible to determine accurately the absolute efficiency of the γ detectors [Ge(Li) for instance].
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