You are correct sir about the FDX dosimeter. I apologize if I implied in an earlier post that it measured any other type of radiation.

As for the validity of any studies...well I'll leave that up to the reader. I have cut and pasted some qoutes from the abstracts of some of these studies. I have also pasted a few links which will take you to other studies. lastly I am pasting a quote from the abstract of a recent Canadian study that I was not previously aware of. I'm sure it will stir the pot a little.

No consistent association between employment period or duration and cancer mortality was observed. A low cardiovascular mortality and an increased mortality caused by aviation accidents were noted. Our study shows that cockpit crew have a low overall mortality. The results are consistent with previous reports of an increased risk of malignant melanoma in airline pilots. Occupational risk factors apart from aircraft accidents seem to be of limited influence with regard to the mortality of cockpit crew in Europe.

Cosmic radiation is an occupational risk factor for commercial aircrews. In this large European cohort study (ESCAPE) its association with cancer mortality was investigated on the basis of individual effective dose estimates for 19,184 male pilots. Mean annual doses were in the range of 2-5 mSv and cumulative lifetime doses did not exceed 80 mSv. All-cause and all-cancer mortality was low for all exposure categories. A significant negative risk trend for all-cause mortality was seen with increasing dose. Neither external and internal comparisons nor nested case-control analyses showed any substantially increased risks for cancer mortality due to ionizing radiation. However, the number of deaths for specific types of cancer was low and the confidence intervals of the risk estimates were rather wide. Difficulties in interpreting mortality risk estimates for time-dependent exposures are discussed.

Incidence of cancer among commercial airline pilotshttp://aje.oxfordjournals.org/cgi/reprint/143/2/137.pdf

Wiley InterScience :: Session Cookies

SpringerLink - Journal Article

Mortality and cancer incidence in airline pilots was studied by Canadian researchers. The study also investigated the leukemia risk associated with in-flight ionizing-radiation exposures. The incidence of prostate cancer and acute myeloid leukemia was significantly increased. Among potential leukemogens to which the pilots might be exposed are ionizing radiation, benzene and electromagnetic fields (EMFs). Airline pilots are exposed to EMFs that range in frequency from 400 Hz to several thousand GHz. [BENER 13721]

Cheers,
AKG