Is this a wind up? Do you ever travel in a car, or cross the road, or expose yourself to the various viruses and germs of the general public? Do you go out in the sun on holiday - and do you fly to your holiday destination? Or do you wrap yourself up in cotton wool at home and feed yourself only pasteurised, homogenised, guaranteed organic, fat-free, non-carcinogenic or toxic foods?
The airlines monitor radiation absorbance, and pilots have a legally limited maximum annual exposure to it, similar to radiographers. Currently, in my airline, the calculated received radiation is about 5% of the maximum annual limit. There is no evidence to suggest that pilots have an increased risk of cancer as a result of cosmic (not galactic) radiation.
Rather than running scared from a subject you have no knowlege of, why don't you do a bit of research into the relative risks that daily life presents? Although, you never know, you could get killed in a car crash on the way to the library. 3500 people in Britain were killed on the roads last year, more than twice the number of people killed in air crashes in the world. Makes you think - I hope.