2.60 How many transcontinental flights would a person have to take in a year to raise the annual radiation dosage to 0.2 Sv?
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A passenger on an airplane flying across the Atlantic receives an extra radiation dose of about $5 \mu$ Sv per hour from cosmic rays. How many hours of flying would it take in one year for a person to double his or her yearly radiation dose? Assume there are no other significant radiation sources besides natural background.
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