出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2011/07/12 04:04 UTC 版)
X-radiation (composed of X-rays) is a form of electromagnetic radiation. X-rays have a wavelength in the range of 0.01 to 10 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz (3×1016 Hz to 3×1019 Hz) and energies in the range 120 eV to 120 keV. They are shorter in wavelength than UV rays and longer than gamma rays. In many languages, X-radiation is called Röntgen radiation, after Wilhelm Conrad Röntgen, who is usually credited as its discoverer, and who had named it X-radiation to signify an unknown type of radiation. Correct spelling of X-ray(s) in the English language includes the variants x-ray(s) and X ray(s). XRAY is used as the phonetic pronunciation for the letter x.
the X-rays―the Roentgen rays
Roentgenism
the line of reflection
Roentgenotherapy.
放射線.
the line of reflection
have an X‐ray examination
the X-rays―the Roentgen rays
Roentgenotherapy.
a wrinkle
rudds