EMI2, the counting efficiency for electron capture by a KL 1 L 2 L 3 M model. The program EMI2 computes the liquid-scintillation counting efficiency for pure electron capture, single isomeric and electron capture-gamma nuclides. In this second version, the atomic rearrangement process subsequent to electron capture is described in terms of a more sophisticated KL 1 L 2 L 3 M model of 264 different pathways. The addition of Coster-Kronig transitions improves the accuracy of the method, especially for nuclides of low atomic numbers. A Monte Carlo method is applied to simulate the photoelectric and Compton interactions of X- and γ-photons with the scintillator inside the vial geometry.

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