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Measurements of the dose due to cosmic rays in aircraft

When the primary particles from space, mainly protons, enter the atmosphere, they produce interactions with air nuclei, and cosmic-ray showers are induced. The radiation field at aircraft altitude is complex, with different types of particles, mainly photons, electrons, positrons and neutrons, with a large energy range. The cosmic radiation dose aboard A320 and ATR 42 aircraft was measured with TLD-100 (LiF:Mg, Ti) detectors and the Mini 6100 semiconductor dosimeter ; radon concentration in the atmosphere was measured with the Alpha Guard radon detector. The estimated occupational effective dose for the aircraft crew (A320) working 500 h per year was 1.64 mSv. Another experiment was performed by the flights Zagreb-Paris– Buenos Aires and reversely, when one measured cosmic radiation dose ; for 26.7 h of flight, the TLD dosimeter registered the total dose of 75 *=mikroSv and the average dose rate was 2.7 *=mikroSv/h. In the same month, February 2005, a traveling to the Japan (24 hours-flight: Zagreb-Frankfurt- Tokyo and reversely) and the TLD-100 measurement showed the average dose rate of 2.4 *=mikroSv/h.

Cosmic radiation ; Aircrew ; Flight level ; Dose rate

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