Are there any studies out there that actually look at the TOTAL radiation doses you receive on a long haul flight rather than just cosmic which is just one type of radiation. The powers at be are more than happy to tell you that there is very little cosmic radiation on an aeroplane but are awfully quiet when it comes to total dosage.
What other types of radiation do you have in mind? Essentially all of the additional radiation burden for people in airplanes at high altitude is ionizing radiation of extraterrestrial origin.