engleski

Some cosmic radiation dose measurements aboard flights connecting Zagreb Airport

When 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 non-neutron component of cosmic radiation dose aboard A320 and ATR40 aircraft was measured with TLD-100 (LIF:Mg, Ti) detectors and the Mini 6100 semiconductor dosimeter ; the neutron dose was measured with the neutron dosimeter consisted of LR-115 track detector and boron foil BN-1 of 10-B converter. The estimated occupational effective dose for the aircraft vrew (A320) working 500 h per year was 1.64 mSv. Another experiment was performed at the flights Zagreb-Paris-Buenos Aires and reversely, when one measured non-neutron cosmic radiation dose ; for 26.7 h of flight, the MINI 6100 dosimeter gave an average dose rate of 2.3 microSv/h and the TLD dosimeter registered the dose equivalent of 75 microSV or the average dose rate of 2.7 microSv/h ; the neutron dosimeter gave the dose rate of 2.4 microSv/h. In the same month, February 2005, a traveling to Japan (24-h-flight: Zagreb-Frankfurt-Tokyo and reversely) and the TLD-100 measurement showed the average dose rate of 2.4 microSv/h ; the neutron dosimeter gave the dose rate of 2, 5 microSv/h. Comparing dose rates of the non-neutron component (low LET) and the neutron one (high LET) of the radiation field at the aircraft flight level, we could conclude that the neutron component carried about 50% of the total dose, that was near other known data.

cosmic radiation ; aircrew ; flight level ; dose rate

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