The other aspect as to why this has come into the public sphere in the manner. Previous negotiations where under an NDA for commercial in confidence, for a new type. Is this negotiation likely to be different? Qantas is not subject to its own requirement, it can leak as necessary to suit its strategic agenda.
Shorthaul would have an average altitude lower
per block hour of flight time than longhaul for a given latitude, and therefore a lower average exposure per flight hour. For a 1:30 block time, time at cruise is likely to only be 20 to 30 minutes. Info:
Flying and health: Cosmic radiation exposure for casual flyers and aircrew.
The FAA have a good document:
What Aircrews Should Know About Their Occupational Exposure to Ionizing Radiation. From the notes for table 3:
The risk of fatal cancer in a working-age population (20-64 years) because of occupational radiation exposure is estimated to be 4 in 100,000 per millisievert (0.004% per millisievert)
You can find your annual and system recorded lifetime exposure at
pcaire.com.