This subject has already been covered here ad nauseam.
http://www.pprune.org/medical-health...ion-doses.html
AMS Gatwick, Airline and Airport Aviation Medical Examiners
However you have to look no further than concorde for all the info you might ever need, and/or if
paranoia is really taking hold.
The supersonic aircraft with the greatest range of all, being able to outfly military aircraft.
The civil aircraft with the greatest radiation exposure profile, because of altitude to reduce drag, c/w highest maximum cruise altitude (60,000ft).
One of the most advanced SST aircraft with the longest unbroken service period (27 years), the only other being TU144 which was a FAIL.
The only civil aircraft fitted with a dosimeter as standard.
This unit was developed and calibrated with the help of Aldermaston nuclear weapons AWRE lab.
You can read about it
here:-
At 60 000ft, the a/c internal usual dose rate is usually around 1mR/h.
For x-rays and gamma rays, 1 rad = 1 rem = 10 mSv
For neutrons, 1 rad = 5 to 20 rem (depending on energy level) = 50-200 mSv
TBQH there are places in the UK, which have almost as high background radiation levels at ground level 24/7/365 than you would get in a/c at FL30. (eg. chiltern hills around High Wycombe).
"nuff said?