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Thanks for that link. A quick search on the PDF file did not find Gamma particles. Most refered to Alpha and neutron. Xray was not mentioned either, both of which can be measured using the Gammarae Pager. Alpha and beta have a low penetration rate, whereas Gamma goes right through the aircraft and the people inside it. Odd that it is not mentioned in that very informative paper?
At the prices they charge and the cost of fuel, they cannot afford to replace the air in the cabin with suitably warmed fresh air. They recycle it far to much. The cabins are chock full of other peoples' germs and other grot.
It's interesting to note that this sort of story always compares radiation doses to chest Xrays. You might wonder why.Here are some data on the radiation doses from various procedures.http://www.radiologyinfo.org/en/safety/index.cfm?pg=sfty_xray&bhcp=1As you can see, chest xrays are about the lowest dose on the list. They correspond to the normal background radiation that you would pick up in about 10 days anyway.The highest exposure listed in AKF's post above (Newark - Hong Kong) is less than that, it's roughly equivalent to 6 days exposure to normal background.