Just a hypothesis I thought of: A lot of cancer cells are developed because of constant background radiation, if you get older you just were exposed to more of

Just a hypothesis I thought of: A lot of cancer cells are developed because of constant background radiation, if you get older you just were exposed to more of it. Elephants have a much higher volume to be affected by it, so just from an evolutionary perspective they had to develop a better resistance. The ones who got cancer early couldn't reproduce as well. Does that make sense? Or does the article say exactly that?