Abstract
If the absolute disintegration rate of a radioactive source with noticeable self absorption containing a nuclide with a complex decay scheme shall be determined with the coincidence method, a correction must be applied which takes into account the branching ratios of the decay scheme, the conversion of the gamma lines, the different self absorption for particles of different β-spectra, and the efficiencies for all particles and γ-rays reached at the special energy discrimination levels. A method is given which allows to derive the decay scheme correction factor μ 0 in the relation N 0=μ 0N ∗ 0 (N ∗ 0= uncorrected disintegration rate) from theoretical considerations for several nuclides. This method is demonstrated in the case of 198Au. For 10μm thick gold foils μ 0 has been calculated in the cases of a 4 πβ- γ- ( ε β = 0.76) and a simple β-γ-coincidence equipment with a plastic β-scintillator (β-discrimination level 250 keV, ε β =0.25). Results are given and compared with that of extrapolation measurements.
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