How radiation affects you. Notice some doses are recorded as 'in a month' others 'per hour' (which would be multiplied by 24 hours in a day and then 30 days in a month) to compare. A total of 100 mSv is the recommended limit of exposure for 5 years.
Apollo took about an hour to pass through the worst part of the radiation belts. The total radiation dose received by the astronauts was about one rem. The Van Allen Radiation Belts consist of a doughnut-shaped region centered on Earth's magnetic equator. The translunar trajectories followed by the Apollo spacecraft were typically inclined about 30 degrees to Earth's equator, therefore Apollo bypassed all but the edges of the radiation belts. http://www.braeunig.us/apollo/VABraddose.htm