Printer Friendly
Dictionary, Encyclopedia and Thesaurus - The Free Dictionary
3,921,259,034 visitors served.
forum Join the Word of the Day Mailing List For webmasters
?
Dictionary/
thesaurus
Medical
dictionary
Legal
dictionary
Financial
dictionary
Acronyms
 
Idioms
Encyclopedia
Wikipedia
encyclopedia
?

photon
(redirected from x-ray photon)

    Also found in: Dictionary/thesaurus, Encyclopedia, Wikipedia 0.01 sec.
photon /pho·ton/ (fo´ton) a particle (quantum) of radiant energy.
pho·ton (ftn)
n.
The quantum of electromagnetic energy, generally regarded as a discrete particle having zero mass, no electric charge, and an indefinitely long lifetime.
pho·tonic adj.
Photon
A light particle.
Mentioned in: Positron Emission Tomography (PET)
photon
[fō′ton]
Etymology: Gk, phos, light
the smallest quantity of electromagnetic energy. It has no mass and no charge but travels at the speed of light. Photons may occur in the form of x-rays, gamma rays, or quanta of light. The energy (E) of a photon is expressed as the product of its frequency (v) and Planck's constant (h), as in the equation E = hv. X-ray photons occur in frequencies of 1018 to 1021 Hz and energies that range upward from 1 KeV.
photon [fo´ton]
a discrete particle (quantum) of radiant energy.
photon (fō´ton),
n a bullet or quantum of electromagnetic radiant energy emitted and propagated from various types of radiation sources. The term should not be used alone but should be qualified by terms that will clarify the type of energy (e.g., light photon, radiographic photon).
photon
a particle (quantum) of radiant energy.
x-ray photon
a particle of x-ray energy.
photon 
The basic unit of radiant energy defined by the equation
E = hν
where h is Planck's constant (6.62 ✕ 10−34 joule ✕ second), ν the frequency of the light and E the energy difference carried away by the emission of a single photon of light. The term photon usually refers to visible light whereas the term quantum refers to other electromagnetic radiations. See quantum theory; wave theory; troland.
Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content.
?Page tools
Printer friendly
Cite / link 		Feedback
Add definition
Mentioned in?  References in periodicals archive?   Medical browser?   Full browser?
 
To create the maps, Clarke's team illuminated the dots with a brilliant X-ray photon beam at Argonne National Laboratory's Advanced Photon Source.
Quantum computers come a step closer to reality by Asian News International
This digital capture method uses a 2-step process called indirect conversion to transform X-ray photons first to visible light and then to an electric charge (Figure 2).
Digital diversity dilemma by Hoppenrath, Margaret / Applied Radiology
In 60 of those TGFs, the energy of at least one gamma-ray photon exceeded 10 million electron-volts (MeV), about 300 times the energy of an X-ray photon in a typical medical scan.
Sky high: gamma-ray bursts are common in Earth's upper atmosphere by Perkins, S. / Science News
 
 
 
Medical Dictionary
?

Terms of Use | Privacy policy | Feedback | Advertise with Us | Copyright © 2012 Farlex, Inc.
Disclaimer
All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.