An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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soft X-rays
  پرتوهای ِ ایکس ِ نرم  
partowhâ-ye iks-e narm
Fr.: rayons X mous  

X-ray photons with energies between about 0.1 to 10 keV. → hard X-rays.

See also: → soft; → X-rays.