Abstract
Measurements have been made on the ion species produced by the positron decay. As a positron emitter, 18F was employed.The radionuclide, 18F(t1/2:110m)was produced by the160(3He, p)18F reaction, using IPCR Cyclotron. The 18F trapped on metal plates were employed as the ion source of a pulse-counting mode of mass spectrometer. The apparatus was the same as previously reported. The ion-expelling voltage was4.5-5.0kV. The result with the18F on the copper plate was as follows:m/e18, 9.5;m/e9, 1.0;m/e6, 1.4;m/e4.5, 2.5;m/e2.8, 4.0. The positrbn decay of 18F and the innershell ionization of 18O formed from 18F may be responsible for this type of spectrum. The yields of the highly charged ions fluctuated with the 18F on the copper plate. However, the fluctuation was not observed with 18F on stainless steel.
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