Abstract
The apparent σ-value for the combined reactions O 16(α,pn)F 18, O 16(α, d)F 18 etc. is fairly high (ca. 200 mbarn at 35 MeV) and the use of α-particles of up to 40 MeV is very advantageous. The average recoil range of the F 18 atoms is about 0·9 mg/cm 2 in silicon in the energy range 25–38 MeV. When a thin surface layer (about 5 mg/cm 2) of irradiated silicon is removed mechanically by manual grinding, the amount of F 18 in the remaining piece, measured with the aid of chemical separation, indicates the oxygen content in the bulk of the silicon. Carbon-11 formed by the reaction C 12(α, αn)C 11 gives a similar recoil effect and the bulk carbon content can also be estimated. This method is also useful for the analysis of other high-melting point metals.
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