Photon burst mass spectrometry has been used to measure 85Kr in a sample with an abundance of 6 X 10-9. Improvements in detection efficiency by the use of avalanche photodiodes cooled to liquid nitrogen temperature are reported, which should make possible measurement of 85Kr at the ambient atmospheric abundance of 10-11.
Progress is reported on the development of a new laser- and mass spectrometer- based technique for measurement of trace levels of radioisotopes. Significant results to date include the demonstration of high efficiency and throughput in a mass spectrometer, efficient production of metastable atoms from Ar+ and Kr+ beams, a demonstration of the photon burst detector principle with Mg+ ions, and the verification of zero background in a two- detector system.
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