German commercial pilots that fly more than 100 hrs a year in aeroplanes capable of higher than FL100 (or something aloike) are subject to radiation monitoring. This is done with a gnereric tool that takes time, date, altitude and route flown and calculates a radiation exposure dosis. Your allowed only to receive a certain amount (forgot the number) and records are to be kept until the individual reaches I think 90 years of age. (same rules than for nuclear powerplant workers)
this was initiated by the german pilots union VC in order to get longterm data in repsect of cancer.
IŽd worry about long exposure in northern latitudes at high altitude.
Edit: Upps, 733 was quicker than me.