Can't remember where I read it but I'm sure someone said that after all this time exposed to all manner of radiation, it probably wouldn't be a great idea to handle / use cameras salvaged from space.
It actually wouldn't cause much of a problem. Thing is there is a big difference between exposition to radiation and exposition to radioactive materials.
In itself, radiation is not cumulative when it comes to non-living organisms. The way it hurts living stuff is that the high energy photons and free neutrons impact the living thing's DNA and break it apart rapidly causing all sort of mutations and malfunctions. But if it has no DNA, it just passes through.
Now exposure to radioactive dust is a whole other story. In itself it won't affect non living things either. But the problem comes when we manipulate the object. The radioactive dust sticks to our skin and keeps on emitting rays. And once the stuff gets into your system it's really bad.
Just as an example, there are a lot of foods, especially meats that get an irradiation treatment. We eat it and are just fine. This is also used a lot in the medical field when it comes to sterilizing implants.
And then, there's Chernobyl... totally different thing.