
A single London to New York flight delivers roughly 37 microsieverts of cosmic radiation — about 1% of the natural dose an average person absorbs from rocks, air and ground across an entire year
A single Heathrow-to-JFK flight delivers around 37 microsieverts of cosmic radiation — roughly 1% of the annual background dose an average person absorbs from rocks, air and their own body. For pilots and cabin crew flying the same routes hundreds of times a year, the arithmetic changes sharply.














