Introduction. Exposure to environment Cosmic Radiation are one important stress in Aviation.The new generation of Commercial Aircrafts actually flight more fast and height in ultra long-haul non-stop flights in international routes.
The most important determinants of Radiation exposure are Altitude, Latitude, time of Flight and date related to the Solar Cycle activity. 
In the field of the Aerospace Medicine the measurement of the radiation exposure (dose rate) of aircrew personnel is very important. Because in the Argentina Republic there are not studies on Physical Dosimetry, we decide to perform in-flight radiation measurements throught an Agreement of Collaboration with the Real Military College of Canada, using a portable and computarized instruments of meassure to cover principally the Electromagnetic spectre (Low LET ) and Corspuscular Radiation ( High LET).  The Dosimetry was realized in two International Routes: New York-Miami-Buenos Aires (Transequatorial) and Buenos Aires-Auckland, New Zealand (Circumpolar).

Materials and Methods. The instruments used were: the ION CHAMBER (IC) to measure the Ionizing compomnent of radiation ( principally gamma Radiation ). The SWENDI to measure only the Neutron component and the TEPC airborne wich measure all types of radiations.
The measurements was realized in the business class cabin of Airbus 340-200 aircraft of Argentine Airlines.  

Results. The Route Dose rate measured in micro-Sieverts were New York-Miami : SWENDI  5.07, IC  6.07, TEPC  11.04. Miami-Bs. Aires : SWENDI  6.73, IC 12.20, TEPC 15.65. Buenos Aires-Auckland: SWENDI  25.87, IC  31.30, TEPC  55.80. The results shown by TEPC agree very well with those from instruments measuring low and high LET Radiation separately.  Based in the examination of these results, the Total Dose Rate is higher in flights at High Latitude when is compared with flights at Low Latitude.
The Neutron Component (High LET) in flights over the equator at Low Latitude Miami-Buenos Aires , represent only one-third of the Total radiation. For the New York-Miami flight and Buenos Aires -Auckland at High Latitude, represent half of the Total radiation (50 % ).

Conclusion. Throught of the Physical Dosimetry in each route, it can be infered the meassure of the annual Dose Rate of AirCrew Personnel on International Routes of  Argentine Airlines. The results indicated an annual exposure between 4 and 6 miliSievert / year, more higher than the International Commission of Radioprotection (ICRP) recommendation for the Public.  
Based in these results we believed that Argentine AirCrew Members should be considered Personnel Occupacionally Exposed to Radiation, in way to be implemented the pertinent ICRP Normative of  Radiovigilance and Radioprotection.