X-ray
Form of electromagnetic radiation
Summary
An X-ray is a form of high-energy electromagnetic radiation with a wavelength shorter than those of ultraviolet rays and longer than those of gamma rays. Roughly, X-rays have a wavelength ranging from 10 nanometers to 10 picometers, corresponding to frequencies in the range of 30 petahertz to 30 exahertz (3×1016 Hz to 3×1019 Hz) and photon energies in the range of 100 eV to 100 keV, respectively.
Originally created by Sodium
10/20/2001, 8:27:41 PM
Modified
5/19/2026, 9:40:24 PM
Recent revisions
Rescuing 1 sources and tagging 0 as dead.) #IABot (v2.0.9.5) ([[User:Aldorias|Aldorias]] - 29284
/* Pre-Röntgen observations and research */ Preserve the full name of Helmholtz
Added links to the names of Philipp Lenard and Helmholtz
There is no reliable source found that supports the claim of complete replacement by about 1920. The claim as written contains a factual inaccuracy. The Wikipedia article editor should correct this claim before any citation is placed. The accurate statement, supported by sources, is that cold cathode tubes continued to be manufactured into the 1920s and saw routine use into the 1930s, with the Coolidge tube achieving broad dominance by the mid-1920s.
Added ORAU Museum citation for Coolidge tube's heated-cathode design.
Added Britannica citation for Fleming's 1904 thermionic diode invention.
Consistent spelling of Röntgen's name in the article
/* Gamma rays */ Sentence reworded
/* 20th century and beyond */ Add citation
remove [[WP:ATODAY]] (via [[WP:JWB]])
remove [[WP:CIRC|mirror of Wikipedia article]] -- not a reliable source, just copied the entire article from us
[[Wikipedia:OABOT|Open access bot]]: url-access=subscription updated in citation with #oabot.
Added source
/* Advances in radiology */ Ce
/* Discovery by Röntgen */ "Hand with ring" is correct translation, not "rings".
Reverted 1 edit by [[Special:Contributions/~2026-12727-84|~2026-12727-84]] ([[User talk:~2026-12727-84|talk]]): Possible [[WP:AISIGNS]]
/* History */Added more historical information
[[Wikipedia:OABOT|Open access bot]]: pmc updated in citation with #oabot.
Reverted [[WP:AGF|good faith]] edits by [[Special:Contributions/FRENCHFRINFRONGFRIES|FRENCHFRINFRONGFRIES]] ([[User talk:FRENCHFRINFRONGFRIES|talk]]): The r is not capitalized.
