L X-ray spectra and E2 internal conversion coefficients in radon and radium

The X-ray spectra resulting from the internal conversion of electric quadrupole transitions following the alpha decay of Th 230 and Ra 226 were analysed with a Si (Li) spectrometer. From the knowledge of the Coster-Kronig and fluorescence yields, the internal conversion coefficients of the E2 transitions from the first excited states in Ra 226 and Rn 222 could be deduced. Results are in good agreement with theoretical values.