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Old 25-05-2018, 12:04 PM   #30
truegroup
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Originally Posted by st jimmy View Post
What kind of paper are you talking about (with added lead?)...
Once again the blithering fizzix comes blundering out.

https://en.wikiversity.org/wiki/Stars/Sun/X-ray_sources

"Although the more energetic X-rays, photons with an energy greater than 30 keV (4,800 aJ) can penetrate the air at least for distances of a few meters (they would never have been detected and medical X-ray machines would not work if this was not the case) the Earth's atmosphere is thick enough that virtually none are able to penetrate from outer space all the way to the Earth's surface. X-rays in the 0.5 to 5 keV (80 to 800 aJ) range, where most celestial sources give off the bulk of their energy, can be stopped by a few sheets of paper; ninety percent of the photons in a beam of 3 keV (480 aJ) X-rays are absorbed by traveling through just 10 cm of air."


Fuck all to do with the sun.


Epic fail. It's like you went and googled x-rays but forgot to add from the sun
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Last edited by truegroup; 25-05-2018 at 12:05 PM.
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