Measurements have been made on the ion species produced by the positron decay. As a positron emitter,
18F was employed.The radionuclide,
18F(t
1/2:110m)was produced by the
160(
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 the
18F 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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