3. γ-photon activation analysis
3.1 Nuclear reactions involved, sources of γ-photons
γ-photons can be used in analysis through two distinct nuclear interactions: photoexcitation and nuclear reaction.
Nuclear photoexcitation leads to a nucleus identical to the initial nucleus but in an excited state; it returns to the normal state by emitting one or more γ photons.
After excitation with relatively low-energy γ photons (a few MeV), this process can be used to assay elements with atomic numbers above 30 (Table 8 ). In practice, the sensitivity of these assays is in the tens of µg to mg range....
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γ-photon activation analysis
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