For the casual pax I see no problem, but for the frequent flyer and crew there is a distinct problem as you will be getting a dose of radiation before you even get started.
My specialist doctor in discussions with me on this topic having just completed successful treatment for lymphoma. Considering the continuing dosage level that flogging around the world in my 4 holer is giving me, I should seriously consider getting out of aviation. Therefore, after serious discussion with the war office I will be doing just that next year. One more year, resigned from training and just enjoy line flying for one year.
Although he didn't say it was the cause, he did say it MAY have contributed, the primary cause being unknown but items like stress are usually considered as most likely.
So I will call it a day next year, relax and take up the three "F's". Fishing, fossicking and.......
Have a nice day