With the nitrogen eliminated, the cabin pressure could be considerably less than sea-level pressure on Earth - about 4.8 psi (pounds per square inch) versus 14.7 psi - and, consequently, the cabin walls could be relatively thin and, therefore, light in weight.'
One of the worst sun flares ever recorded happened in August 1972, which was between the Apollo 16 and 17 missions. This single flare would have delivered 960 rem of virtually instant death to any astronaut who was up in Space, and yet all of the Apollo astronauts were carrying out their missions in what amounts to nothing more than a thick linen suit.
These pressure suits may have helped protect the astronauts against heat or micro meteorites, but certainly would not have given any radiation protection. By the way, there is no known method of registering when and how strong Solar flare activity will be. So, I guess NASA just struck lucky!
The radiation would have greatly affected the film that was shot on the Moon. Physicist Dr David Groves Ph.D., has carried out radiation tests on similar film and found that the lowest radiation level (25 rem) applied to a portion of the film after exposure made the image on the film almost entirely obliterated. Why didn't that happen to the Apollo films?
Readers will be interested to hear that the biggest Solar Flare for 25 years was recorded in April, 2001. So sceptics who are claiming that NASA know when the Solar Flares are going to appear are talking rubbish - as usual. If this were the case, why didn't they bring down the astronauts from the Shuttle and ISS if they knew this gigantic Solar Flare was about to erupt?
Probably the most convincing argument however about the dangers of radiation to astronauts comes from NASA themselves. Read this report made on 8th September, 2005. It makes very interesting reading, especially when you have a number of sceptics like I have breathing down my neck trying to claim otherwise!