I started doing a bit of research on this this morning at work... but someone came along and actually distracted me with, can you believe it... some work!
This might be of interest:
http://www.lunaranomalies.com/rad.htm
Scroll down till you see Table 1. The paragraph following that I think says it all:
"
While this table does not include the results from Apollo's 16 or 17, there is enough data to conclude that the actual radiation exposure that the astronauts endured was very small. It never came close to being lethal or even damaging."
Al.