Part a should be 14 and part b should be 5:
a) Dose rate estimates for a mission to Mars consist of 1.9 mSv/d during each 180-d outbound and return flight, and 0.7 mSv/d while on Mars for nearly 2 y. What fraction or multiple of the annual NRC dose limits do the astronauts receive during total flight time and while exploring the planet each year?
b) How many days before the occupational dose limit is reached on the International Space Station where the dose rate is approximately 0.25 mSv/d?
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