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Γραμμή 23:
https://en.wikipedia.org/wiki/Background_radiation
Background radiation is the ubiquitous ionizing radiation that people on the planet Earth are exposed to, including natural and artificial sources. Both natural and artificial background radiation varies depending on location and altitude.
 
 
===Cosmic background radiation===
https://en.wikipedia.org/wiki/Cosmic_background_radiation
Cosmic background radiation is electromagnetic radiation from the sky with no discernible source. The origin of this radiation depends on the region of the spectrum that is observed. One component is the cosmic microwave background radiation.
 
δεν κατέστρεψα άρθρο, διόρθωσα τίτλο αφου ήταν σε λάθος θέση,
 
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