Abstract
In order to realize the efficient and selective ionization of Sr and Ba isotopes with a He-jet type ISOL for fission products, a fluorination method has been investigated using a surface ionization ion source coupled with a skimmer system. The ionization characteristics have been studied as functions of the ionizer temperature and the CF 4 gas flow rate. It has been found that high ionization efficiencies for SrF and BaF can be achieved with a relatively low ionizer temperature (1900°C) similarly to the oxidation method for lanthanides. Elemental selection in the same mass chain can be done simultaneously by this method and pure Sr or Ba activities in fission products are available.
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