Editing Electron–positron annihilation (section)

==Practical uses==
The electron–positron annihilation process is the physical phenomenon relied on as the basis of [[positron emission tomography]] (PET) and [[positron annihilation spectroscopy]] (PAS). It is also used as a method of measuring the [[Fermi surface]] and [[band structure]] in [[metal]]s by a technique called [[Angular Correlation of Electron Positron Annihilation Radiation]].
It is also used for nuclear transition.
Positron annihilation spectroscopy is also used for the study of [[crystallographic defect]]s in metals and semiconductors;
it is considered the only direct probe for vacancy-type defects.<ref>
{{cite journal
 |author=F. Tuomisto and I. Makkonen
 |year=2013
 |title=Defect identification in semiconductors with positron annihilation: Experiment and theory
 |journal=[[Reviews of Modern Physics]]
 |volume=85 |issue=4
 |pages=1583–1631
 |doi=10.1103/RevModPhys.85.1583
|bibcode=2013RvMP...85.1583T|hdl=10138/306582
 |s2cid=41119818
 |url=https://aaltodoc.aalto.fi/handle/123456789/30859
 |hdl-access=free
 }}</ref>