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Photon burst mass spectrometry: ultrasensitive detection of rare isotopes

Progress is reported on the development of a new technique for measurement of trace levels of radioisotopes which is based on fluorescence detection of output from a mass spectrometer. Significant achievements include the observation of fluorescence and burst signals from Kr isotopes, including enriched samples of 85Kr with a 4- collector system. An isotopic abundance sensitivity of about 10-8 is demonstrates with 83Kr and 85Kr.