Unfortunately that chart doesn't work for any kind of ingested radioactive substance, and it's kind of disingenous for Randall to present it as if it's a meaningful comparison. There's plan radiation, and then there's radioactive contamination in dust, liquid or aerosol form, and the second one is the gift that keeps on giving.
IANAhealthphysicist, but I can read Wikipedia, and I'm pretty sure you get a lot more radiation damage to your cells if you eat or breathe in a radioactive particle than if you sit next to the same number of bequerels on the bench, because your body can incoporate the radioactive emitter directly into your cells for the entire rest of its (maximum of bioactive and radioactive) lifespan, and your skin won't screen out the alpha radiation like it does for an internal source. Iodine-equivalents are pretty nasty since although they have a half-life on the order of days, if they get inside you they dump all that radiation into your thyroid, which is not a good place to have it. Long-term, Radioactive strontium is the worst because it replaces calcium and so binds directly to your bone marrow, which is not good for leukemia. And potassium-equivalents are in the mid range, with a half-life on the order of months to years and they are bioavailable, but not permanently so. As far as we know.
Oh, and a lot of those last have been dumped into the ocean by Fukushima, and are now inside fish. Do they bioaccumulate up the food chain? We're not really sure, but we'll probably find out. It's a wonderful science experiment!
tldr: Don't eat, drink or breathe radioactive gunk. It's worse for you than it looks.