Abstract
Among the most widely used medical radionuclides there are isotopes of elements with relatively low ionization potential. The simplest type of a mass-separator ion-source in this case is a hot cavity surface ionizer. However, the ionization efficiency of such a type of ionizer for non-alkalis is low (for example, of about 1% for Tl). To increase the surface ionization efficiency, a new material for the surface ion source (monocrystalline tungsten) was used at the mass separator working on-line with the 1-GeV proton synchrocyclotron of Petersburg Nuclear Physics Institute. The ionization efficiency for certain elements with medium ionization potential (Sr, In, Tl) was measured: 45(5)%, 33(8)%, and 21(8)% respectively.
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