Why is there radiation from air travel?

[DarkNess_wtc]

today's biology lession

our teacher about cancer

he said that if we travell somewhere by aeroplane,

it's equal to take X-way 3 times

i don't understand why we have radiation through traveling by aeroplane

can someone explain to me, please

thank you so　much

 

[Andy Resnick]

Less atmosphere between you and the source.

 

[Astronuc]

The source being solar radiation (high energy particles (HEP) such as protons and electrons) and cosmic radiation (higher energy protons, various nuclei, and electrons), and the secondary particles from nuclear reactions between the solar and cosmic radiation (HEP) and the gas atoms in the atmosphere.

http://www2.slac.stanford.edu/vvc/cosmicrays/

http://www2.slac.stanford.edu/vvc/cosmic_rays.html

http://imagine.gsfc.nasa.gov/docs/science/know_l1/cosmic_rays.html

http://hyperphysics.phy-astr.gsu.edu/HBASE/astro/cosmic.html

http://www.srl.caltech.edu/personnel/dick/cos_encyc.html

http://www.ngdc.noaa.gov/stp/SOLAR/COSMIC_RAYS/cosmic.html (The high energy particles affect airplane passengers -- the FAA has an online cosmic ray airline flight profile calculation available.)