| Popis: |
The interference effects for the 110 and 197 keV γ-ray lines of the nuclear reactions 19 F(p,p ′ γ ) 19 F and 18 O(p,γ) 19 F were studied quantitatively. For this, thick liquid targets were examined by proton induced gamma-ray emission (PIGE) using an external proton beam of 3.4 MeV energy. Several grades of dilutions were prepared from 76.3% 18 O enriched H 2 O and from 1000 ppm F standard NaF solution. From this, a data base was obtained in order to extrapolate the 110 and 197 keV γ-ray yields of the 18 O(p,γ) 19 F reaction for a target of water containing 0.2% 18 O. As a result it was obtained that, for fluorine in oxygen-rich materials, the reaction 19 F(p,p ′ γ) 19 F allows minimum detection limits of (1.06±0.12) and (1.85±0.2) at.ppm for the 110 and 197 keV γ-rays, respectively. |
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