Ion Beam Analysis for Forensic Science - SPIRIT
Ion Beam Analysis for Forensic Science - SPIRIT
Ion Beam Analysis for Forensic Science - SPIRIT
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Particle Induced Gamma-ray Emission<br />
• MeV protons can tunnel through the Coulomb barrier<br />
of light nuclei to induce gamma-emitting g nuclear<br />
reactions<br />
• Gamma energy is characteristic of specific isotopes<br />
• Detection limits ~ 10-100ppm<br />
• Useful <strong>for</strong> light elements: Al, F, Li, B, Na, Mg<br />
• Sharp resonances in the excitation function can be<br />
used <strong>for</strong> depth profiling<br />
^3 f:\pc_users\jpn\971118\490001g4._ : Tourmaline std: GRR573<br />
^2<br />
F<br />
F<br />
Li<br />
B Al Al<br />
Na<br />
^1<br />
^0<br />
Tourmaline standard<br />
GRR573<br />
100 300 500 700 900 1100 1300 1500 1700
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