you didn't answer the question. The amount in orbit is about the same as on the Moon. The old Corona spy satellites had no gamma protection. Gamma sources just aren't as common as you think they are. The shuttle had to "occasionally" (wording used in your report) deal with high energy radiation mainly because over the course of many missions it dealt with far more radiation than Apollo did. You still need to prove radiation would have been a problem on the relatively short Apollo missions. You haven't yet.