Abstract
The internal-external conversion (IEC) method is a technique for the experimental determination of internal conversion coefficients (ICCs) by measuring separately the quantities that define the ICC, that is, the emission rates of internal conversion (IC) electrons and the accompanying gamma rays. The measurements are performed in magnetic spectrometers and present no particular problems on the IC side because the IC electrons can be assumed to be emitted isotropically in space. The gamma rays have to be studied indirectly by measuring the number of photoelectrons (EC electrons) that are emitted when the gamma rays are absorbed in thin layers of heavy elements (converters). The IEC method is a technique by which an ICC can be determined with no previous knowledge of the decay in question required. Therefore, this method is well suited for work with complex decays, provided sources that are strong enough can be obtained.
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