Editing X-ray (section)

===Gamma rays===
There is no consensus for a definition distinguishing between X-rays and [[gamma ray]]s. One common practice is to distinguish between the two types of radiation based on their source: X-rays are emitted by [[electron]]s, while gamma rays are emitted by the [[atomic nucleus]].<ref name="Dendy">{{Cite book | vauthors = Denny PP, Heaton B |title= Physics for Diagnostic Radiology |publisher= CRC Press |date= 1999 |location= US |page= 12 |url= https://books.google.com/books?id=1BTQvsQIs4wC&pg=PA12 |isbn= 978-0-7503-0591-4}}</ref><ref>{{Cite book | vauthors = Feynman R, Leighton R, Sands M |title= The Feynman Lectures on Physics | volume = 1 |publisher= Addison-Wesley |date= 1963 |location= US |pages= 2–8 |isbn= 978-0-201-02116-5}}</ref><ref>{{Cite book | vauthors = L'Annunziata M, Abrade M |title= Handbook of Radioactivity Analysis |publisher= Academic Press |date= 2003 |page= 58 |url= https://books.google.com/books?id=b519e10OPT0C&q=gamma+x-ray&pg=PA58 |isbn= 978-0-12-436603-9}}</ref><ref>{{Cite book | vauthors = Grupen C, Cowan G, Eidelman SD, Stroh T |title= Astroparticle Physics |publisher= Springer |date= 2005 |page= 109 |isbn= 978-3-540-25312-9}}</ref> This definition has several problems: other processes can also generate these high-energy [[photon]]s, or sometimes the method of generation is not known. One common alternative is to distinguish X- and gamma radiation on the basis of wavelength (or, equivalently, frequency or photon energy), with radiation shorter than some arbitrary wavelength, such as 10<sup>−11</sup>&nbsp;m (0.1&nbsp;[[Angstrom|Å]]), defined as gamma radiation.<ref>{{Cite book |editor= Hodgman, Charles |title= CRC Handbook of Chemistry and Physics, 44th Ed |publisher= Chemical Rubber Co. |date= 1961 |location= US |page= 2850}}</ref> This criterion assigns a photon to an unambiguous category, but is only possible if wavelength is known. (Some measurement techniques do not distinguish between detected wavelengths.) However, these two definitions often coincide since the electromagnetic radiation emitted by [[X-ray tube]]s generally has a longer wavelength and lower photon energy than the radiation emitted by [[radioactive]] [[atomic nucleus|nuclei]].<ref name="Dendy" /> Occasionally, one term or the other is used in specific contexts due to historical precedent, based on measurement (detection) technique, or based on their intended use rather than their wavelength or source.
Thus, gamma-rays generated for medical and industrial uses, for example [[radiotherapy]], in the ranges of 6–20&nbsp;[[MeV]], can in this context also be referred to as X-rays.<ref>{{Cite web |url=http://www.ccohs.ca/ |title=Radiation – Quantities and Units of Ionizing Radiation: OSH Answers |last=Government of Canada |first=Canadian Centre for Occupational Health and Safety |date=9 May 2019 |website=CCOHS.ca |access-date=2019-05-09 }}</ref>