The hospitals have been sending the patients with radioactive iodine consumption home with instructions to flush twice. Don't hug your kids or your dog. But other than that....
The fact is that our sewers have been receiving radioactive materials for some time. Consider that patients that can afford to stay at near by hotels while receiving treatment. Down the toilet. Even at home it is down the toilet or perhaps you have a medical crisis, feel faint, woozy, even while in the tub or shower and let urine pass; what happens to it? Without any strong flushing action, does the radioactivity stay in the lowest level of the p-trap?
What if you are living in subsidized housing or a senior high rise tower.......does the radioactive material stay in the p-trap for the life of the material, thousands of years? Even when the building is torn down decades later the radioactivity is still strong.
Try finding a site on the net discussing these problems, there isn't one because the blind eye is turned to this problem.
Why are not patients sent home with a badge notifying the individual of his/her radioactivity?
One site on the net disclosed that radioactive machinery was dumped into the concrete supply making the frame of an apartment complex and decades later tracked down only to find that the residents of the apartment --current and former---all had health problems.
We let this problem go undetected due to radiations lack of visibility. Like radon from our basements, it can't be seen or heard. Radon was first detected (Wiki) on a nuclear plant worker at the plant only to be tracked down to his home!
An undiscovered part of our violent history could very well be due to this silent threat. The human organism is not compatible with radiation exposure regardless of our so-called background radiation exposure.
If theories of planetary core heating --mine among them---are correct in surmising the heating is due to solar cosmic ray production, it is possible that we being subjected to a bath of cosmic rays that damage our immune system among other tragedies.