Medicine:Particle-induced gamma emission
Particle-induced gamma emission (PIGE) is a form of nuclear reaction analysis, one of the ion beam analysis thin-film analytical techniques.
Technology
Typically, an MeV proton beam is directed onto a sample which may be tens of microns thick, and the fast protons may excite the target nuclei such that gamma rays are emitted. These may be used to characterise the sample. For example, sodium in glass is of great importance but can be hard to measure non destructively: X-ray fluorescence (XRF) and particle-induced X-ray emission (PIXE) are both sensitive only to the surface few microns of the sample because of the low energy (and consequent high absorption coefficient) of the Na K X-rays (1.05 keV). But, for example, the 23Na(p,p'γ)23Na reaction has a high and relatively well-known cross-section (see the IAEA "IBANDL" site[1]) and is therefore frequently used for determining bulk sodium content of glasses, since the gamma energy (440 keV) is so high that there is effectively no absorption. The IAEA has sponsored the development of a database of PIGE cross-sections.[2]
Applications
PIGE has been used to detect total fluorine as a screening tool for per- and polyfluoroalkyl substances (PFASs).[3][4][5]
References
- ↑ "IBANDL". https://www-nds.iaea.org/exfor/ibandl.htm.
- ↑ Dimitriou, P.; Becker, H.-W.; Bogdanović-Radović, I.; Chiari, M.; Goncharov, A.; Jesus, A.P.; Kakuee, O.; Kiss, A.Z. et al. (2016). "Development of a Reference Database for Particle-Induced Gamma-ray Emission spectroscopy". Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 371: 33–36. doi:10.1016/j.nimb.2015.09.052. Bibcode: 2016NIMPB.371...33D. http://orbi.ulg.ac.be/handle/2268/200104.
- ↑ Ritter, Evelyn E.; Dickinson, Margaret E.; Harron, John P.; Lunderberg, David M.; DeYoung, Paul A.; Robel, Alix E.; Field, Jennifer A.; Peaslee, Graham F. (September 2017). "PIGE as a screening tool for Per- and polyfluorinated substances in papers and textiles". Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 407: 47–54. doi:10.1016/j.nimb.2017.05.052. Bibcode: 2017NIMPB.407...47R.
- ↑ Tighe, Meghanne; Jin, Yukun; Whitehead, Heather D.; Hayes, Kathleen; Lieberman, Marya; Pannu, Meeta; Plumlee, Megan H.; Peaslee, Graham F. (2021-12-10). "Screening for Per- and Polyfluoroalkyl Substances in Water with Particle Induced Gamma-Ray Emission Spectroscopy" (in en). ACS ES&T Water 1 (12): 2477–2484. doi:10.1021/acsestwater.1c00215.
- ↑ Tokranov, Andrea K.; Nishizawa, Nicole; Amadei, Carlo Alberto; Zenobio, Jenny E.; Pickard, Heidi M.; Allen, Joseph G.; Vecitis, Chad D.; Sunderland, Elsie M. (2019-01-08). "How Do We Measure Poly- and Perfluoroalkyl Substances (PFASs) at the Surface of Consumer Products?" (in en). Environmental Science & Technology Letters 6 (1): 38–43. doi:10.1021/acs.estlett.8b00600. PMID 33283017. Bibcode: 2019EnSTL...6...38T.
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