Abstract
A study has been made of the radiations from the neutron-deficient isotopes 203Bi, 204Bi, 205Bi and 204 m Pb, principally by conversion electron spectroscopy with four 180° electron spectrographs of the permanent-magnet type. The decay schemes of the bismuth isotopes are found to be very complex, and in spite of high-resolution studies and some coincidence work, unique level schemes cannot be given in any case. A new transition in the decay of the 1hr 204Pb isomer has been identified at 289·5 keV, and this is interpretated as arising from a 4 + state of 204Pb at 1563 keV. A comparison is given of the results of the present study of 205Bi decay with those of other recent spectroscopic studies of the 205Pb levels.
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