"The radiation dosage for a year on the moon is between 110 mSv and 380 mSv. On Earth, that dosage is 2.4 mSv, or higher, depending on where you are exactly. Bottom line, the few days in Lunar orbit would have aged the film due to radiation between 50-150 days/ day in orbit maximum, thus it would be the equivalent of film that was aged a few years at most. The environment at the Moon is more likely to have high energy effects, which I'll get to later. Chernobyl produced about 80 mSv/ second after the incident, considerably more than on the surface of the Moon! To this day, the dosage at the center of Chernobyl is around 10 mSv/ second.
The Apollo missions were launched near the Solar Minimum, which would tend to have more higher cosmic ray strikes, and higher overall radiation, but fewer solar storms.
Furthermore, there actually ARE signs of radiation in some of the images, if you look carefully. At the very least, it's dust in on the film, the two can be difficult to tell apart. For instance, look in high resolution at the dark portion of this image. The lines that run through it are quite possibly signs of radiation strikes, or even (gasp!) stars."
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Spec for the Lunar TV Camera: https://www.hq.nasa.gov/alsj/WEC-Engineer-3-1968.pdf