Vous voyez un niveau supérieur dans la matinée, que durant la soirée, peut-être puisque le soleil était dans le ciel, pour la section Montréal à Toronto. Pour le vol du matin, le plus haut niveau était d'environ 50x le niveau de fond. Pour le vol de retour le soir, il était d'environ 45x le fond. Ceci est calculé avec le maximum divisé par le minimum.
Vous voulez savoir plus sur les rayon cosmique, consultez Wikipédia.
This week, I went from Montreal (Quebec) to Toronto (Ontario) in Canada and back. The flight lasted less than 1 hours both ways. I had my Geiger counter with me and captured the radiation level, during the flight, which is mostly cosmic ray. I then used a flight altitude information web site to get the elevation. I then plotted the radiation level and elevation (feet) with time. I also plotted the radiation level versus the elevation, showing the equation which is not linear but a third degree polynomial. The more you go up, the more radiation you are exposed to.
You see a higher level in the morning, than during the evening, possibly because the sun was in the sky, for the Montreal to Toronto section. For the morning flight, the highest level was around 50x the background level. For the return flight at night, it was around 45x the background. This is Max over Min.
Want to know more on cosmic rays, check Wikipedia.
Montreal -> Toronto, 8:20 AM / 8:20.
Toronto -> Montreal 6:30 PM / 18:30
Data Excel Data
UPDATE: 1 Nov 2014
More information can be found here on radiation in plane
https://web.archive.org/web/20130723025848/https://hps.org/publicinformation/ate/q5647.html
And you can use this web page to measure the in-flight exposure
http://jag.cami.jccbi.gov./cariprofile.asp
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